Update tested versions of ruby and rails

.github/workflows/ruby.yml

@@ -18,13 +18,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ['2.7', '3.0']
-        rails: ['6.1.4.6', '7.0.2.2']
+        ruby: ['3.1', '3.2', '3.3']
+        rails: ['7.0.8']
         include:
           - ruby: '2.7'
             rails: '5.2.3'
           - ruby: '2.7'
-            rails: '6.0.0'
+            rails: '6.0.6.1'
+          - ruby: '3.0'
+            rails: '6.0.6.1'
+          - ruby: '3.1'
+            rails: '6.1.7.6'
     steps:
     - uses: actions/checkout@v2
     - name: Set up Ruby