test against Moodle 4.1 as well

Author: bluetom

.github/workflows/config.json

@@ -2,7 +2,8 @@
   "main-moodle": "MOODLE_405_STABLE",
   "main-php": "8.3",
   "moodle-php": {
-    "MOODLE_405_STABLE": ["8.3"]
+    "MOODLE_401_STABLE": ["8.0","8.1"],
+    "MOODLE_405_STABLE": ["8.1","8.2","8.3"]
   },
   "moodle-plugin-ci": "4.4.5"
 }