Bump rack from 3.1.4 to 3.1.5 (#639)

Bumps [rack](https://github.com/rack/rack) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.4...v3.1.5)

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

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Gemfile.lock

@@ -222,7 +222,7 @@ GEM
     puma (6.4.2)
       nio4r (~> 2.0)
     racc (1.8.1)
-    rack (3.1.4)
+    rack (3.1.5)
     rack-cors (2.0.2)
       rack (>= 2.0.0)
     rack-session (2.0.0)