Merge pull request coderdojo-japan#1661 from coderdojo-japan/dependabot/bundler/rack-2.2.13

Bump rack from 2.2.12 to 2.2.13

Author: yasulab

Gemfile.lock

@@ -331,7 +331,7 @@ GEM
       get_process_mem (>= 0.2)
       puma (>= 2.7)
     racc (1.8.1)
-    rack (2.2.12)
+    rack (2.2.13)
     rack-attack (6.7.0)
       rack (>= 1.0, < 4)
     rack-host-redirect (1.3.0)