Update ruby and rails matrix to supported versions

Author: brendon

.github/workflows/test.yml

@@ -59,20 +59,21 @@ jobs:
         # To keep matrix size down, only test highest and lowest rubies. In
         # `.rubocop.yml`, set `TargetRubyVersion`, to the lowest ruby version
         # tested here.
-        ruby: ["2.6", "3.3"]
-        rails: ["5.2", "6.0", "6.1", "7.0", "7.1", "7.2", "8.0"]
+        ruby: ["3.1", "3.2", "3.3", "3.4"]
+        rails: ["7.0", "7.1", "7.2", "8.0"]
         exclude:
           # rails 7 requires ruby >= 2.7.0
-          - ruby: "2.6"
-            rails: "7.0"
-          - ruby: "2.6"
-            rails: "7.1"
-          - ruby: "2.6"
-            rails: "7.2"
-          - ruby: "2.6"
-            rails: "8.0"
-          - ruby: "3.3"
-            rails: "5.2"
+          - rails: "7.0"
+            ruby: "3.1"
+          - rails: "7.0"
+            ruby: "3.2"
+          - rails: "7.0"
+            ruby: "3.3"
+          - rails: "7.0"
+            ruby: "3.4"
+          - rails: "8.0"
+            ruby: "3.1"
+
     steps:
       - name: Checkout source
         uses: actions/checkout@v4