docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -1506,6 +1506,15 @@
       "contributions": [
         "bug"
       ]
+    },
+    {
+      "login": "Dennis273",
+      "name": "Dennis273",
+      "avatar_url": "https://avatars.githubusercontent.com/u/19815164?v=4",
+      "profile": "https://github.com/Dennis273",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "repoHost": "https://github.com"