Bump itertools from 0.10.1 to 0.10.3 (#4476)

Bumps [itertools](https://github.com/rust-itertools/itertools) from 0.10.1 to 0.10.3.
- [Release notes](https://github.com/rust-itertools/itertools/releases)
- [Changelog](https://github.com/rust-itertools/itertools/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-itertools/itertools/compare/v0.10.1...v0.10.3)

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

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