…udPlatform/python-docs-samples#1892)

…udPlatform/python-docs-samples#1892)

…udPlatform/python-docs-samples#1892)

…udPlatform/python-docs-samples#1892)

Also update the `docs` session to 3.10 to match the Python GAPIC code
generator used to generate Cloud Client libraries:
https://github.com/googleapis/gapic-generator-python/blob/d20dd2876fbf8c35f6a994639864815b0d7608ab/gapic/templates/noxfile.py.j2#L360-L361

Also update black to 23.7.0 to resolve the following stack trace

```
nox > python -m pip install flake8 flake8-import-order docutils click==8.0.4 black==19.3b0
nox > python -m pip install -e .
nox > black --check google tests tests_async noxfile.py setup.py docs/conf.py
Traceback (most recent call last):
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/bin/black", line 8, in <module>
    sys.exit(patched_main())
             ~~~~~~~~~~~~^^
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/black.py", line 3754, in patched_main
    main()
    ~~~~^^
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/click/core.py", line 1128, in __call__
    return self.main(*args, **kwargs)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/click/core.py", line 1053, in main
    rv = self.invoke(ctx)
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/click/core.py", line 1395, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/click/core.py", line 754, in invoke
    return __callback(*args, **kwargs)
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/click/decorators.py", line 26, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/tmpfs/src/github/google-auth-library-python/.nox/lint/lib/python3.14/site-packages/black.py", line 434, in main
    loop = asyncio.get_event_loop()
  File "/usr/local/lib/python3.14/asyncio/events.py", line 715, 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'.
nox > Command black --check google tests tests_async noxfile.py setup.py docs/conf.py failed with exit code 1
```

This PR also fixes the coverage presubmit to append the coverage check
to run across python runtimes.

…e` (#1892)