test_request_with_content test fails with httpcore 0.15.0, Flask 2.2.2, and Werkzeug 2.2.2

[mcepl]

When packaging this package for openSUSE/Factory (from the tarball here on GitHub) test_request_with_content test fails:

[   17s] =================================== FAILURES ===================================
[   17s] __________________________ test_request_with_content ___________________________
[   17s] 
[   17s] httpbin = <pytest_httpbin.serve.Server object at 0x7f5c9d61c5b0>
[   17s] 
[   17s]     def test_request_with_content(httpbin):
[   17s]         url = f"{httpbin.url}/post"
[   17s]         response = httpcore.request("POST", url, content=b'{"hello":"world"}')
[   17s] >       assert response.status == 200
[   17s] E       assert 500 == 200
[   17s] E        +  where 500 = <Response [500]>.status
[   17s] 
[   17s] tests/test_api.py:19: AssertionError
[   17s] ----------------------------- Captured stderr call -----------------------------
[   17s] 127.0.0.1 - - [23/Nov/2022 13:44:11] "POST /post HTTP/1.1" 500 265
[   17s] ------------------------------ Captured log call -------------------------------
[   17s] ERROR    httpbin.core:app.py:1741 Exception on /post [POST]
[   17s] Traceback (most recent call last):
[   17s]   File "/usr/lib/python3.8/site-packages/flask/app.py", line 2525, in wsgi_app
[   17s]     response = self.full_dispatch_request()
[   17s]   File "/usr/lib/python3.8/site-packages/flask/app.py", line 1822, in full_dispatch_request
[   17s]     rv = self.handle_user_exception(e)
[   17s]   File "/usr/lib/python3.8/site-packages/flask/app.py", line 1820, in full_dispatch_request
[   17s]     rv = self.dispatch_request()
[   17s]   File "/usr/lib/python3.8/site-packages/flask/app.py", line 1796, in dispatch_request
[   17s]     return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)
[   17s]   File "/usr/lib/python3.8/site-packages/httpbin/core.py", line 427, in view_post
[   17s]     return jsonify(
[   17s]   File "/usr/lib/python3.8/site-packages/httpbin/core.py", line 73, in jsonify
[   17s]     response = flask_jsonify(*args, **kwargs)
[   17s]   File "/usr/lib/python3.8/site-packages/flask/json/__init__.py", line 342, in jsonify
[   17s]     return current_app.json.response(*args, **kwargs)
[   17s]   File "/usr/lib/python3.8/site-packages/flask/json/provider.py", line 281, in response
[   17s]     warnings.warn(
[   17s] DeprecationWarning: The 'JSONIFY_PRETTYPRINT_REGULAR' config key is deprecated and will be removed in Flask 2.3. Set 'app.json.compact' instead.
[   17s] ================= 1 failed, 141 passed, 15 deselected in 2.68s =================

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