Bump rack from 2.2.13 to 2.2.20 in /api

Bumps [rack](https://github.com/rack/rack) from 2.2.13 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@v2.2.13...v2.2.20)

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

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

Author: dependabot[bot]

api/Gemfile.lock

@@ -579,7 +579,7 @@ GEM
     puma (6.4.0)
       nio4r (~> 2.0)
     racc (1.7.1)
-    rack (2.2.13)
+    rack (2.2.20)
     rack-attack (6.7.0)
       rack (>= 1.0, < 4)
     rack-cors (1.1.1)