chore(deps): Update Prek to v0.3.9

[renovate]

This PR contains the following updates:

Package	Update	Change
prek	patch	0.3.8 → 0.3.9

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Release Notes

j178/prek (prek)

v0.3.9

Compare Source

Released on 2026-04-13.

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prek auto-update is now stricter about pinned revisions and more useful in CI.
It now keeps rev and # frozen: comments in sync, can detect
impostor commits when validating pinned SHAs,
and lets you use prek auto-update --check to fail on both available updates and frozen-ref
mismatches without rewriting the config.

Examples:

$ prek auto-update

# updates revs and repairs stale `# frozen:` comments

$ prek auto-update --freeze

# writes frozen SHAs with matching `# frozen: <tag>` comments

$ prek auto-update --check

# exits non-zero when updates are available, a `# frozen:` comment is stale,
# or a pinned SHA does not belong to the fetched upstream refs

Enhancements

• Check and sync frozen comments during auto-update (#​1896)
• Handle impostor commits in auto-update (#​1919)
• Add experimental language: dotnet support (#​1871)
• Honor repo and worktree core.hooksPath (#​1892)
• Add prek run --no-fail-fast to override config file (#​1859)
• Add forbid-new-submodules as builtin hook (#​1853)
• Clean stale patch files in cache gc (#​1877)
• Display auto-update results by config entry (#​1922)
• Restrict patch directory permissions (#​1876)
• Show tag names in auto-update --freeze output (#​1916)
• Use a bitset for hook stages (#​1860)

Bug fixes

• Canonicalize CWD and GIT_ROOT paths (#​1878)
• Ensure quotes are added for non-string revisions in auto-update (#​1936)

Documentation

• Update docs for case of hooks modifying files with a non-zero exit code (#​1879)

Contributors

• @​RicardoVercetti
• @​nathanjmcdougall
• @​renovate
• @​sadjow
• @​j178

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