Bump rack from 2.2.6.4 to 2.2.20

Bumps [rack](https://github.com/rack/rack) from 2.2.6.4 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@v2.2.6.4...v2.2.20)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 2.2.20
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     nio4r (2.5.8)
     puma (4.3.12)
       nio4r (~> 2.0)
-    rack (2.2.6.4)
+    rack (2.2.20)
 
 PLATFORMS
   ruby