chore(deps): bump filelock from 3.32.7 to 4.0.0

[dependabot]

Bumps filelock from 3.32.7 to 4.0.0.

Release notes

Sourced from filelock's releases.

4.0.0

What's Changed

• 🐛 fix(soft-rw): replace the state mutex with a generation log by @​gaborbernat in tox-dev/filelock#738

Full Changelog: tox-dev/filelock@3.32.7...4.0.0

Changelog

Sourced from filelock's changelog.

########### Changelog ###########

.. towncrier-draft-entries:: Unreleased

.. towncrier release notes start

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4.0.0 (2026-09-17)

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• The :class:~filelock.SoftReadWriteLock on-disk protocol is a generation log under <path>.rw, and a process running an earlier release does not see it: an old and a new participant on one lock path do not exclude each other. Stop every participant, upgrade them all, then restart them; the new code ignores leftover .state, .write and .readers/ files, and you can delete them. The filesystem must provide no-replace hard links, as it must for :class:~filelock.StrictSoftFileLock, so a runtime without os.link raises :class:~filelock.SoftFileLockProtocolError on acquire. Constructing a singleton again with a different on_compromise, or with poll_interval at or above stale_threshold, now raises :class:ValueError. :pr:735
• :class:~filelock.SoftReadWriteLock exposes :attr:~filelock.SoftReadWriteLock.generation as a fencing token for the protected resource and reports a lost hold through on_compromise and :attr:~filelock.SoftReadWriteLock.compromise. :pr:735
• :class:~filelock.SoftReadWriteLock no longer deadlocks when a holder dies on another host mid-transition, and release() no longer waits on a mutex a dead host left behind (:pr:725, :pr:735). The state mutex is gone. Each transition is one atomic snapshot commit, and liveness is a heartbeat nonce read on the observer's own clock rather than an mtime read against another host's. :pr:735

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3.32.7 (2026-09-16)

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• Validate final-symlink refusal by error number so the test works across libc implementations. :pr:737
• Document that :meth:~filelock.BaseFileLock.acquire reads blocking=None as the lock's blocking attribute and raises :class:~filelock.Timeout after one attempt when blocking=False. :pr:733

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3.32.6 (2026-09-08)

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• SoftFileLease and AsyncSoftFileLease now reject a boolean or non-finite lease_duration, which used to publish an owner record their own owner property reads back as malformed. :pr:723
• Reject non-finite heartbeat, stale, and polling intervals in SoftReadWriteLock and AsyncSoftReadWriteLock, including cached singleton construction and overflow in the default stale threshold. :pr:724
• Honor acquisition timeouts and blocking=False during SoftReadWriteLock state-mutex contention, including failed writer cleanup. Cross-host recovery of an abandoned .state marker remains unsupported. :pr:726
• Allow acquiring existing lock files that grant write access through group permissions or an ACL even when their owner-write mode bit is unset. :pr:728
• Preserve exception notes and custom attributes when copying or pickling Timeout and SoftFileLockProtocolError. :pr:729

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... (truncated)

Commits

• 7e57436 Release 4.0.0
• f974328 🐛 fix(soft-rw): replace the state mutex with a generation log (#738)
• See full diff in compare view

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