Bump hashbrown from 0.15.3 to 0.15.4 (#99)

Bumps [hashbrown](https://github.com/rust-lang/hashbrown) from 0.15.3 to 0.15.4.
- [Release notes](https://github.com/rust-lang/hashbrown/releases)
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](rust-lang/hashbrown@v0.15.3...v0.15.4)

---
updated-dependencies:
- dependency-name: hashbrown
  dependency-version: 0.15.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]