Bump pretty_assertions from 1.3.0 to 1.4.0 in /rust (#341)

Bumps [pretty_assertions](https://github.com/rust-pretty-assertions/rust-pretty-assertions) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/rust-pretty-assertions/rust-pretty-assertions/releases)
- [Changelog](https://github.com/rust-pretty-assertions/rust-pretty-assertions/blob/main/CHANGELOG.md)
- [Commits](rust-pretty-assertions/rust-pretty-assertions@v1.3.0...v1.4.0)

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

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