Bump rack from 3.1.8 to 3.1.12

Bumps [rack](https://github.com/rack/rack) from 3.1.8 to 3.1.12.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v3.1.8...v3.1.12)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -250,7 +250,7 @@ GEM
       json
       websocket (~> 1.0)
     racc (1.8.1)
-    rack (3.1.8)
+    rack (3.1.12)
     rack-test (2.1.0)
       rack (>= 1.3)
     rake (13.2.1)