Fix testing to be compatible with Rails 7 dependencies

Author: anakinj

.github/workflows/test.yml

@@ -34,7 +34,6 @@ jobs:
           - gemfiles/rack1.gemfile
           - gemfiles/rack2.gemfile
           - gemfiles/rack_edge.gemfile
-          - gemfiles/rails_edge.gemfile
           - gemfiles/rails_5.gemfile
           - gemfiles/rails_6.gemfile
           - gemfiles/rails_6_1.gemfile
@@ -52,6 +51,9 @@ jobs:
           - ruby: 2.7
             gemfile: 'gemfiles/multi_xml.gemfile'
             experimental: false
+          - ruby: 2.7
+            gemfile: 'gemfiles/rails_edge.gemfile'
+            experimental: false
           - ruby: "ruby-head"
             experimental: true
           - ruby: "truffleruby-head"