Bump rack from 3.0.11 to 3.0.12 (#100)

Bumps [rack](https://github.com/rack/rack) from 3.0.11 to 3.0.12.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/commits/v3.0.12)

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

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Gemfile.lock

@@ -29,7 +29,7 @@ GEM
       racc
     prettier_print (1.2.1)
     racc (1.8.0)
-    rack (3.0.11)
+    rack (3.0.12)
     rainbow (3.1.1)
     regexp_parser (2.9.2)
     rexml (3.3.9)