Bump rack from 2.2.6.2 to 2.2.6.4 (#2466)

Bumps [rack](https://github.com/rack/rack) from 2.2.6.2 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@v2.2.6.2...v2.2.6.4)

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

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Gemfile.lock

@@ -522,7 +522,7 @@ GEM
       get_process_mem (~> 0.2)
       puma (>= 2.7)
     racc (1.6.2)
-    rack (2.2.6.2)
+    rack (2.2.6.4)
     rack-attack (5.4.2)
       rack (>= 1.0, < 3)
     rack-proxy (0.7.0)