fix(deps): update dependency nodebb-plugin-mentions to v2.8.3 (#8449)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

install/package.json

@@ -85,7 +85,7 @@
         "nodebb-plugin-emoji": "^3.3.0",
         "nodebb-plugin-emoji-android": "2.0.0",
         "nodebb-plugin-markdown": "8.11.2",
-        "nodebb-plugin-mentions": "2.8.2",
+        "nodebb-plugin-mentions": "2.8.3",
         "nodebb-plugin-soundpack-default": "1.0.0",
         "nodebb-plugin-spam-be-gone": "0.7.2",
         "nodebb-rewards-essentials": "0.1.3",