cargo: bump hashbrown from 0.15.0 to 0.15.2

Bumps [hashbrown](https://github.com/rust-lang/hashbrown) from 0.15.0 to 0.15.2.
- [Changelog](https://github.com/rust-lang/hashbrown/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/hashbrown/commits)

---
updated-dependencies:
- dependency-name: hashbrown
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>