Bump the dev-dependencies group with 3 updates

Bumps the dev-dependencies group with 3 updates: [assert_cmd](https://github.com/assert-rs/assert_cmd), [assert_fs](https://github.com/assert-rs/assert_fs) and [predicates](https://github.com/assert-rs/predicates-rs).


Updates `assert_cmd` from 2.0.14 to 2.0.15
- [Changelog](https://github.com/assert-rs/assert_cmd/blob/master/CHANGELOG.md)
- [Commits](assert-rs/assert_cmd@v2.0.14...v2.0.15)

Updates `assert_fs` from 1.1.1 to 1.1.2
- [Changelog](https://github.com/assert-rs/assert_fs/blob/master/CHANGELOG.md)
- [Commits](assert-rs/assert_fs@v1.1.1...v1.1.2)

Updates `predicates` from 3.1.0 to 3.1.2
- [Changelog](https://github.com/assert-rs/predicates-rs/blob/master/CHANGELOG.md)
- [Commits](assert-rs/predicates-rs@v3.1.0...v3.1.2)

---
updated-dependencies:
- dependency-name: assert_cmd
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: assert_fs
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: predicates
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
...

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