Bumps [regex](https://github.com/rust-lang/regex) from 1.3.7 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](rust-lang/regex@regex-1.3.7...1.3.9) Signed-off-by: dependabot-preview[bot] <support@dependabot.com>