Bump rack from 3.1.10 to 3.1.12 in /gemfiles/rails_71 (#664)

Bumps [rack](https://github.com/rack/rack) from 3.1.10 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@v3.1.10...v3.1.12)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Geremia Taglialatela <[email protected]>

Author: dependabot[bot]

gemfiles/rails_71/Gemfile.lock

@@ -169,7 +169,7 @@ GEM
       stringio
     public_suffix (6.0.1)
     racc (1.8.1)
-    rack (3.1.10)
+    rack (3.1.12)
     rack-session (2.1.0)
       base64 (>= 0.1.0)
       rack (>= 3.0.0)