gh-140874: Upgrade bundled pip to 25.3

[notatallshaw]

Fixes #140874

• Issue: Update bundled pip to 25.3 #140874

[efimov-mikhail]

LGTM

[miss-islington-app]

Thanks @notatallshaw for the PR, and @pfmoore for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[miss-islington-app]

Thanks @notatallshaw for the PR, and @pfmoore for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖 I'm not a witch! I'm not a witch!

[bedevere-app]

GH-140880 is a backport of this pull request to the 3.13 branch.

[bedevere-app]

GH-140881 is a backport of this pull request to the 3.14 branch.

[pfmoore]

Thanks @notatallshaw

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot s390x RHEL9 Refleaks 3.x (tier-3) has failed when building commit d440a0f.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1589/builds/2400) and take a look at the build logs.
4. Check if the failure is related to this commit (d440a0f) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1589/builds/2400

Failed tests:

• test.test_multiprocessing_fork.test_processes

Failed subtests:

• test_interrupt - test.test_multiprocessing_fork.test_processes.WithProcessesTestProcess.test_interrupt

Summary of the results of the build (if available):

==

Click to see traceback logs

Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/contextlib.py", line 85, in inner
    return func(*args, **kwds)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 596, in test_interrupt
    exitcode = self._kill_process(multiprocessing.Process.interrupt)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/contextlib.py", line 85, in inner
    return func(*args, **kwds)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 577, in _kill_process
    self.assertEqual(join(), None)
                     ~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 250, in __call__
    return self.func(*args, **kwds)
           ~~~~~~~~~^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 156, in join
    res = self._popen.wait(timeout)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 44, in wait
    return self.poll(os.WNOHANG if timeout == 0.0 else 0)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 28, in poll
    pid, sts = os.waitpid(self.pid, flag)
               ~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 573, in handler
    raise RuntimeError('join took too long: %s' % p)
RuntimeError: join took too long: <Process name='Process-931' pid=1629009 parent=1618586 started daemon>


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/contextlib.py", line 85, in inner
    return func(*args, **kwds)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 596, in test_interrupt
    exitcode = self._kill_process(multiprocessing.Process.interrupt)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/contextlib.py", line 85, in inner
    return func(*args, **kwds)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 577, in _kill_process
    self.assertEqual(join(), None)
                     ~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 250, in __call__
    return self.func(*args, **kwds)
           ~~~~~~~~~^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 156, in join
    res = self._popen.wait(timeout)
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 44, in wait
    return self.poll(os.WNOHANG if timeout == 0.0 else 0)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/popen_fork.py", line 28, in poll
    pid, sts = os.waitpid(self.pid, flag)
               ~~~~~~~~~~^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 573, in handler
    raise RuntimeError('join took too long: %s' % p)
RuntimeError: join took too long: <Process name='Process-5' pid=1678499 parent=1678493 started daemon>


Traceback (most recent call last):
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 320, in _bootstrap
    self.run()
    ~~~~~~~~^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/buildbot/buildarea/3.x.cstratak-rhel9-s390x.refleak/build/Lib/test/_test_multiprocessing.py", line 524, in _sleep_some_event
    time.sleep(100)
    ~~~~~~~~~~^^^^^
KeyboardInterrupt
k

[pfmoore]

I'm going to say that buildbot failure isn't related to this PR. If anyone thinks otherwise, please say so.