Update dependency overcommit to v0.64.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
overcommit (changelog)	0.63.0 -> 0.64.0

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Release Notes

sds/overcommit (overcommit)

### [`v0.64.0`](https://redirect.github.com/sds/overcommit/blob/HEAD/CHANGELOG.md#0640) [Compare Source](https://redirect.github.com/sds/overcommit/compare/v0.63.0...v0.64.0) - Add support for `stylelint` 16+ - Add `changelog_uri` to gemspec

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, check this box

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