ci: add Moodle 5.1

Author: smbader

.github/workflows/ci.yml

@@ -34,6 +34,9 @@ jobs:
           - php: '8.4'
             moodle-branch: 'main'
             database: 'mariadb'
+          - php: '8.4'
+            moodle-branch: 'MOODLE_501_STABLE'
+            database: 'pgsql'
           - php: '8.4'
             moodle-branch: 'MOODLE_500_STABLE'
             database: 'mariadb'
@@ -43,15 +46,9 @@ jobs:
           - php: '8.2'
             moodle-branch: 'MOODLE_404_STABLE'
             database: 'mariadb'
-          - php: '8.1'
-            moodle-branch: 'MOODLE_403_STABLE'
-            database: 'pgsql'
           - php: '8.0'
             moodle-branch: 'MOODLE_401_STABLE'
             database: 'pgsql'
-          - php: '7.2'
-            moodle-branch: 'MOODLE_39_STABLE'
-            database: 'mariadb'
 
     steps:
       - name: Check out repository code