Bump rack from 2.2.8.1 to 2.2.12 (#64)

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

Author: dependabot[bot]

Gemfile.lock

@@ -23,7 +23,7 @@ GEM
     public_suffix (5.0.4)
     puma (6.4.3)
       nio4r (~> 2.0)
-    rack (2.2.8.1)
+    rack (2.2.12)
     rack-protection (2.2.4)
       rack
     rchardet (1.8.0)