Renovate: Pin freemarker version

renovate.json

@@ -48,6 +48,14 @@
       "matchPackageNames": [
         "org.greenrobot:greendao"
       ]
+    },
+    {
+      "description": "Version pinned to the one used by upstream greenDao to avoid regressions. Only used for code generation.",
+      "matchPaths": "GBDaoGenerator/**",
+      "allowedVersions": "2.3.23",
+      "matchPackageNames": [
+        "org.freemarker:freemarker"
+      ]
     }
   ]
 }