Update ruby and rails to test against

Author: philnash

.github/workflows/tests.yml

@@ -8,43 +8,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.6, 2.7, "3.0", 3.1, 3.2, 3.3, 3.4, "4.0", head]
-        rails: [4.2.11.3, 5.0.7.2, 5.1.7, 5.2.4.4, 6.0.3.4, 6.1.0, 7.0.3.1]
-        exclude:
-          # Ruby 2.6 and Rails 7 do not get along together.
-          - ruby: 2.6
-            rails: 7.0.3.1
-          # Ruby 3.0 and Rails 5 do not get along together.
-          - ruby: "3.0"
-            rails: 5.0.7.2
-          - ruby: "3.0"
-            rails: 5.1.7
-          - ruby: "3.0"
-            rails: 5.2.4.4
-          - ruby: 3.1
-            rails: 5.0.7.2
-          - ruby: 3.1
-            rails: 5.1.7
-          - ruby: 3.1
-            rails: 5.2.4.4
-          - ruby: 3.2
-            rails: 5.0.7.2
-          - ruby: 3.2
-            rails: 5.1.7
-          - ruby: 3.2
-            rails: 5.2.4.4
-          - ruby: 3.3
-            rails: 5.0.7.2
-          - ruby: 3.3
-            rails: 5.1.7
-          - ruby: 3.3
-            rails: 5.2.4.4
-          - ruby: head
-            rails: 5.0.7.2
-          - ruby: head
-            rails: 5.1.7
-          - ruby: head
-            rails: 5.2.4.4
+        ruby: [3.1, 3.2, 3.3, 3.4, "4.0", head]
+        rails: [7.2, 8.0, 8.1]
     continue-on-error: ${{ endsWith(matrix.ruby, 'head') }}
     env:
       RAILS_VERSION: ${{ matrix.rails }}