Bump regex from 1.5.4 to 1.7.3 in /rust-spell-check (#77)

Bumps [regex](https://github.com/rust-lang/regex) from 1.5.4 to 1.7.3.
- [Release notes](https://github.com/rust-lang/regex/releases)
- [Changelog](https://github.com/rust-lang/regex/blob/master/CHANGELOG.md)
- [Commits](rust-lang/regex@1.5.4...1.7.3)

---
updated-dependencies:
- dependency-name: regex
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>