Build(deps): Bump unf_ext from 0.0.7.6 to 0.0.7.7 (#9306)

Bumps [unf_ext](https://github.com/knu/ruby-unf_ext) from 0.0.7.6 to 0.0.7.7.
- [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/commits)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -405,7 +405,7 @@ GEM
       execjs (>= 0.3.0, < 3)
     unf (0.1.4)
       unf_ext
-    unf_ext (0.0.7.6)
+    unf_ext (0.0.7.7)
     unicode-display_width (1.6.1)
     unicorn (5.5.4)
       kgio (~> 2.6)