Filelock

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* CI improvements by gaborbernat in https://github.com/tox-dev/filelock/pull/362


**Full Changelog**: https://github.com/tox-dev/filelock/compare/3.16.0...3.16.1

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Test Python 3.13 by hugovk in https://github.com/tox-dev/filelock/pull/352
* Add 3.13 to CI by gaborbernat in https://github.com/tox-dev/filelock/pull/359


**Full Changelog**: https://github.com/tox-dev/filelock/compare/3.15.4...3.16.0

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Pass `file_lock` as positional argument by kwist-sgr in https://github.com/tox-dev/filelock/pull/347


**Full Changelog**: https://github.com/tox-dev/filelock/compare/3.15.3...3.15.4

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Add test for virtualenv stability by gaborbernat in https://github.com/tox-dev/filelock/pull/344
* Fix `TypeError: _CountedFileLock.__init__() got an unexpected keyword argument 'timeout'` by kwist-sgr in https://github.com/tox-dev/filelock/pull/345


**Full Changelog**: https://github.com/tox-dev/filelock/compare/3.15.2...3.15.3

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Use a metaclass to implement the singleton pattern by kwist-sgr in https://github.com/tox-dev/filelock/pull/340

New Contributors
* kwist-sgr made their first contribution in https://github.com/tox-dev/filelock/pull/340

**Full Changelog**: https://github.com/tox-dev/filelock/compare/3.15.1...3.15.2

<!-- Release notes generated using configuration in .github/release.yml at main -->

What's Changed
* Hotfix: Restore __init__ method; more robust initialization for singleton locks by ethanbb in https://github.com/tox-dev/filelock/pull/338


**Full Changelog**: https://github.com/tox-dev/filelock/compare/3.15.0...3.15.1