Update plugins.json

Author: Soulter

plugins.json

@@ -1,4 +1,9 @@
 {
+  "astrbot_plugin_grok_filter": {
+    "author": "Cheng-MaoMao",
+    "repo": "https://github.com/Cheng-MaoMao/astrbot_plugin_grok_filter",
+    "desc" "过滤 grok-3-reasoner 推理模型的思维链内容"
+  },
   "FavorSystem": {
     "author": "wuyan1003",
     "repo": "https://github.com/wuyan1003/likability-level",