Don't test against Rails 7.1 yet, no stable gems out

Author: pokonski

.github/workflows/ruby.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        rails_version: ['4.2.7', '5.1.0', '5.2.0', '6.0.0', '6.1.0', '7.0', '7.1']
+        rails_version: ['4.2.7', '5.1.0', '5.2.0', '6.0.0', '6.1.0', '7.0']
         ruby-version: ['2.6', '2.7', '3.0', '3.1']
         exclude:
           - ruby-version: '3.0'
@@ -53,8 +53,6 @@ jobs:
             rails_version: '6.1'
           - ruby-version: '2.6'
             rails_version: '7.0'
-          - ruby-version: '2.6'
-            rails_version: '7.1'
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby