fix(deps): bump rack from 2.2.6.3 to 2.2.6.4 in /pact_broker (#118)

Bumps [rack](https://github.com/rack/rack) from 2.2.6.3 to 2.2.6.4.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.6.3...v2.2.6.4)

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

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pact_broker/Gemfile.lock

@@ -106,7 +106,7 @@ GEM
     puma (5.6.5)
       nio4r (~> 2.0)
     racc (1.6.2)
-    rack (2.2.6.3)
+    rack (2.2.6.4)
     rack-protection (2.2.4)
       rack
     rainbow (3.1.1)