build(deps): bump regex-syntax from 0.8.6 to 0.8.7 (#379)

Bumps [regex-syntax](https://github.com/rust-lang/regex) from 0.8.6 to 0.8.7.
- [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-syntax-0.8.6...regex-syntax-0.8.7)

---
updated-dependencies:
- dependency-name: regex-syntax
  dependency-version: 0.8.7
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]