Bump rack from 3.1.3 to 3.1.5

Bumps [rack](https://github.com/rack/rack) from 3.1.3 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@v3.1.3...v3.1.5)

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

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

Gemfile.lock

@@ -49,7 +49,7 @@ GEM
       ast (~> 2.4.1)
       racc
     racc (1.8.0)
-    rack (3.1.3)
+    rack (3.1.5)
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.9.2)