Drop Ruby 2.7 and ActiveRecord v6.0 support in CI

Author: peerkleio

.github/workflows/ci.yaml

@@ -15,12 +15,10 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - 2.7
           - 3.0
           - 3.1
           - 3.2
         active-record-version:
-          - 6.0.0
           - 6.1.0
           - 7.0.0
           - 7.1.0