Bump rack from 3.1.16 to 3.1.20

Bumps [rack](https://github.com/rack/rack) from 3.1.16 to 3.1.20.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.16...v3.1.20)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 3.1.20
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -356,7 +356,7 @@ GEM
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.8.1)
-    rack (3.1.16)
+    rack (3.1.20)
     rack-cors (3.0.0)
       logger
       rack (>= 3.0.14)