Update dependency django to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
django	==5.2.6 → ==6.1

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: Pipfile.lock

Command failed: pipenv lock
Creating a virtualenv for this project
Pipfile: /tmp/renovate/repos/github/StefanMich/SpotifyRandomAlbum/Pipfile
Using /usr/local/bin/python 3.11.15 to create virtualenv...
created virtual environment CPython3.11.15.final.0-64-x86_64 in 935ms
  creator 
CPython3Posix(dest=/runner/cache/others/virtualenvs/SpotifyRandomAlbum-LTKS0Mp1,
clear=False, no_vcs_ignore=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, via=copy, 
app_data_dir=/tmp/containerbase/cache/.cache/virtualenv)
    added seed packages: pip==26.2, setuptools==83.0.0
  activators 
BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator
,PythonActivator,XonshActivator

✔ Successfully created virtual environment!
Virtualenv location: /runner/cache/others/virtualenvs/SpotifyRandomAlbum-LTKS0Mp1
Locking  dependencies...
ERROR: No matching distribution found for django==6.1

The conflict is caused by:
    The user requested django==6.1
Traceback (most recent call last):
  File 
"/opt/containerbase/tools/pipenv/2026.7.1/3.11.15/lib/python3.11/site-packages/p
ipenv/routines/lock.py", line 113, in do_lock
    venv_resolve_deps(
  File 
"/opt/containerbase/tools/pipenv/2026.7.1/3.11.15/lib/python3.11/site-packages/p
ipenv/utils/resolver.py", line 1981, in venv_resolve_deps
    results = _run_resolver_subprocess(
              ^^^^^^^^^^^^^^^^^^^^^^^^^
  File 
"/opt/containerbase/tools/pipenv/2026.7.1/3.11.15/lib/python3.11/site-packages/p
ipenv/utils/resolver.py", line 1601, in _run_resolver_subprocess
    locked = _dispatch_resolver_response(response, st)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File 
"/opt/containerbase/tools/pipenv/2026.7.1/3.11.15/lib/python3.11/site-packages/p
ipenv/utils/resolver.py", line 1715, in _dispatch_resolver_response
    raise exc
pipenv.exceptions.ResolutionFailure: ERROR: ERROR: No matching distribution 
found for django==6.1

The conflict is caused by:
    The user requested django==6.1