Downgrade codemirror dependency to v5.65.1

Author: maliming

npm/packs/codemirror/package.json

@@ -6,7 +6,7 @@
   },
   "dependencies": {
     "@abp/core": "~10.0.0-rc.2",
-    "codemirror": "^6.0.2"
+    "codemirror": "^5.65.1"
   },
   "gitHead": "bb4ea17d5996f01889134c138d00b6c8f858a431",
   "homepage": "https://abp.io",