chore(contracts)(deps): bump rand from 0.8.8 to 0.9.5 in /contracts

Bumps [rand](https://github.com/rust-random/rand) from 0.8.8 to 0.9.5.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/0.9.5/CHANGELOG.md)
- [Commits](rust-random/rand@0.8.8...0.9.5)

---
updated-dependencies:
- dependency-name: rand
  dependency-version: 0.9.5
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]