[internal] Bump itertools from 0.10.1 to 0.10.3 in /src/rust/engine (#14260)
[internal] Bump itertools from 0.10.1 to 0.10.3 in /src/rust/engine (#14260)

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)
benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,pantsbuild/pants,benjyw/pants,benjyw/pants,pantsbuild/pants,benjyw/pants,pantsbuild/pants