Bump bumpalo from 3.9.1 to 3.12.0 in /examples/rust/rust-functions (#…

…2446)

Bumps [bumpalo](https://github.com/fitzgen/bumpalo) from 3.9.1 to 3.12.0.
- [Release notes](https://github.com/fitzgen/bumpalo/releases)
- [Changelog](https://github.com/fitzgen/bumpalo/blob/main/CHANGELOG.md)
- [Commits](fitzgen/bumpalo@3.9.1...3.12.0)

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

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