Filelock

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- Fix mypy does not accept ``filelock.FileLock`` as a valid type

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- Bump project dependencies
- Add timeout unit to docstrings
- Support 3.11

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- Make the readme documentation point to the index page

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- Add ability to return immediately when a lock cannot be obtained

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- Fix pylint warning "Abstract class :class:`WindowsFileLock <filelock.WindowsFileLock>` with abstract methods instantiated"
:pr:`135` - by :user:`vonschultz`
- Fix pylint warning "Abstract class :class:`UnixFileLock <filelock.UnixFileLock>` with abstract methods instantiated"
:pr:`135` - by :user:`vonschultz`

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- Use ``time.monotonic`` instead of ``time.time`` for calculating timeouts.