build(deps): bump rack from 2.2.19 to 2.2.20 (#4604)

Bumps [rack](https://github.com/rack/rack) from 2.2.19 to 2.2.20.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.19...v2.2.20)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 2.2.20
  dependency-type: indirect
...

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Author: dependabot[bot]

Gemfile.lock

@@ -391,7 +391,7 @@ GEM
     puma (7.0.4)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (2.2.19)
+    rack (2.2.20)
     rack-protection (3.2.0)
       base64 (>= 0.1.0)
       rack (~> 2.2, >= 2.2.4)