build(deps): bump proptest from 1.2.0 to 1.3.1
Bumps [proptest](https://github.com/proptest-rs/proptest) from 1.2.0 to 1.3.1.
- [Release notes](https://github.com/proptest-rs/proptest/releases)
- [Changelog](https://github.com/proptest-rs/proptest/blob/master/CHANGELOG.md)
- [Commits](https://github.com/proptest-rs/proptest/compare/v1.2.0...v1.3.1)
---
updated-dependencies:
- dependency-name: proptest
dependency-type: direct:production
update-type: version-update:semver-minor
...
Signed-off-by: dependabot[bot] <support@github.com>