Bump rand_chacha from 0.3.0 to 0.3.1 (#3225)

Bumps [rand_chacha](https://github.com/rust-random/rand) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-random/rand/compare/rand_chacha-0.3.0...rand_chacha-0.3.1

)

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

Signed-off-by: dependabot[bot] <[email protected]>

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