build(deps): bump hashbrown from 0.15.0 to 0.15.2 in /app/bot (#77)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Edoardo Rosa <[email protected]>