Added Ruby 4.0 and Truffleruby to the build matrix

Author: kpumuk

.github/workflows/tests.yml

@@ -11,19 +11,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version:
-          - "3.1"
-          - "3.2"
-          - "3.3"
-          - "3.4"
-        rails-version:
-          - "6.1"
-          - "7.0"
-          - "7.1"
-          - "7.2"
-          - "8.0"
-          - "8.1"
-          - "edge"
+        ruby-version: ["3.1", "3.2", "3.3", "3.4", "4.0", "truffleruby"]
+        rails-version: ["6.1", "7.0", "7.1", "7.2", "8.0", "8.1", "edge"]
         include:
           - ruby-version: "3.3"
             rails-version: "8.0"