Bump itertools from 0.12.0 to 0.12.1

Bumps [itertools](https://github.com/rust-itertools/itertools) from 0.12.0 to 0.12.1.
- [Changelog](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md)
- [Commits](rust-itertools/itertools@v0.12.0...v0.12.1)

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

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