Drop RSpec CI / Ruby: 3.2, Rails: ~> 6.1.0

Not applicable for ruby 3.2 as it is not supported.
See: rails/rails#46883 (comment)

Author: ydah

.github/workflows/ci.yml

@@ -65,9 +65,8 @@ jobs:
               RAILS_VERSION: "~> 7.0.0"
 
           # Rails 6.1 builds >= 2.5
-          - ruby: "3.2"
-            env:
-              RAILS_VERSION: "~> 6.1.0"
+          # Not applicable for ruby 3.2 as it is not supported.
+          # See: https://github.com/rails/rails/issues/46883#issuecomment-1371325906
           - ruby: "3.1"
             env:
               RAILS_VERSION: "~> 6.1.0"