[CI] black in pre-commit broken

[orbeckst]

Describe the bug

The pre-commit hook fails with an issue with black that seems unrelated to the commit itself.

See https://github.com/MDAnalysis/UserGuide/actions/runs/33778483285/job/100726038569?pr=443

Expected behavior
pre-commit runs all tools

Actual behavior

pre-commit run --show-diff-on-failure --color=always --all-files
...

black....................................................................Failed
  - hook id: black
  - exit code: 1
  
  Traceback (most recent call last):
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/bin/black", line 6, in <module>
      sys.exit(patched_main())
               ~~~~~~~~~~~~^^
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/black/__init__.py", line 1455, in patched_main
      main()
      ~~~~^^
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/click/core.py", line 1631, in __call__
      return self.main(*args, **kwargs)
             ~~~~~~~~~^^^^^^^^^^^^^^^^^
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/click/core.py", line 1552, in main
      rv = self.invoke(ctx)
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/click/core.py", line 1415, in invoke
      return ctx.invoke(self.callback, **ctx.params)
             ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/click/core.py", line 910, in invoke
      return callback(*args, **kwargs)
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/click/decorators.py", line 34, in new_func
      return f(get_current_context(), *args, **kwargs)
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/black/__init__.py", line 570, in main
      reformat_many(
      ~~~~~~~~~~~~~^
          sources=sources,
          ^^^^^^^^^^^^^^^^
      ...<4 lines>...
          workers=workers,
          ^^^^^^^^^^^^^^^^
      )
      ^
    File "/home/runner/.cache/pre-commit/repouhkhhhr9/py_env-python3.14/lib/python3.14/site-packages/black/__init__.py", line 767, in reformat_many
      loop = asyncio.get_event_loop()
    File "/opt/hostedtoolcache/Python/3.14.7/x64/lib/python3.14/asyncio/events.py", line 718, in get_event_loop
      raise RuntimeError('There is no current event loop in thread %r.'
                         % threading.current_thread().name)
  RuntimeError: There is no current event loop in thread 'MainThread'.
  
  mypy.....................................................................Passed
  flake8...................................................................Passed
  Error: Process completed with exit code 1.

Additional context
see #443