Bump rackup from 2.2.0 to 2.2.1 (#4064)

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

Author: dependabot[bot]

Gemfile.lock

@@ -313,7 +313,7 @@ GEM
     rack-test (2.1.0)
       rack (>= 1.3)
     rack-timeout (0.7.0)
-    rackup (2.2.0)
+    rackup (2.2.1)
       rack (>= 3)
     rails (7.2.2)
       actioncable (= 7.2.2)