Bump rack from 3.1.11 to 3.1.12 in the bundler group (#266)

Bumps the bundler group with 1 update: [rack](https://github.com/rack/rack).


Updates `rack` from 3.1.11 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@v3.1.11...v3.1.12)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -64,7 +64,7 @@ GEM
       ast (~> 2.4.1)
       racc
     racc (1.8.1)
-    rack (3.1.11)
+    rack (3.1.12)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest