Build(deps): Bump unf_ext from 0.0.8 to 0.0.8.1 (#16172)

Bumps [unf_ext](https://github.com/knu/ruby-unf_ext) from 0.0.8 to 0.0.8.1.
- [Release notes](https://github.com/knu/ruby-unf_ext/releases)
- [Changelog](https://github.com/knu/ruby-unf_ext/blob/master/CHANGELOG.md)
- [Commits](https://github.com/knu/ruby-unf_ext/compare/v0.0.8...v0.0.8.1)

---
updated-dependencies:
- dependency-name: unf_ext
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

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

Gemfile.lock

@@ -461,7 +461,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.8)
+    unf_ext (0.0.8.1)
     unicode-display_width (2.1.0)
     unicorn (6.1.0)
       kgio (~> 2.6)