Run tests with Redmine 6.0.0

Author: PowerKiKi

.github/workflows/test.yml

@@ -11,8 +11,8 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.7', '3.0', '3.1']
-        redmine: ['5.0-stable', 'master']
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
+        redmine: ['5.0-stable', '6.0-stable', 'master']
         db: ['postgres', 'mysql']
       fail-fast: false