Add RuboCop Performance 1.25, RuboCop Rails 2.31, and RuboCop Minitest 0.38

Author: koic

antora-playbook.yml

@@ -75,6 +75,7 @@ content:
           "v0.35.0",
           "v0.36.0",
           "v0.37.1",
+          "v0.38.0",
         ]
       start_path: docs
     - url: https://github.com/rubocop/rubocop-performance.git
@@ -94,6 +95,7 @@ content:
           "v1.22.1",
           "v1.23.1",
           "v1.24.0",
+          "v1.25.0",
         ]
       start_path: docs
     - url: https://github.com/rubocop/rubocop-rails.git
@@ -117,6 +119,7 @@ content:
           "v2.28.0",
           "v2.29.0",
           "v2.30.0",
+          "v2.31.0",
         ]
       start_path: docs
     - url: https://github.com/rubocop/rubocop-rspec.git