Merge pull request #19 from rails/dependabot/bundler/rack-2.2.20

Bump rack from 2.2.6.4 to 2.2.20

Author: rafaelfranca

Gemfile.lock

@@ -4,7 +4,7 @@ GEM
     nio4r (2.5.8)
     puma (4.3.12)
       nio4r (~> 2.0)
-    rack (2.2.6.4)
+    rack (2.2.20)
 
 PLATFORMS
   ruby