Bump regex from 1.3.8 to 1.3.9 (#10308)
* Bump regex from 1.3.8 to 1.3.9
Bumps [regex](https://github.com/rust-lang/regex) from 1.3.8 to 1.3.9.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-lang/regex/compare/1.3.8...1.3.9)
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* [auto-commit] Update all Cargo lock files
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