Build(deps): Bump unf from 0.1.4 to 0.2.0 (#28411)

Bumps [unf](https://github.com/knu/ruby-unf) from 0.1.4 to 0.2.0.
- [Changelog](https://github.com/knu/ruby-unf/blob/master/CHANGELOG.md)
- [Commits](https://github.com/knu/ruby-unf/compare/v0.1.4...v0.2.0)

---
updated-dependencies:
- dependency-name: unf
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -555,9 +555,7 @@ GEM
       tzinfo (>= 1.0.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
-    unf (0.1.4)
-      unf_ext
-    unf_ext (0.0.9.1)
+    unf (0.2.0)
     unicode-display_width (2.5.0)
     unicorn (6.1.0)
       kgio (~> 2.6)