docs: update .all-contributorsrc [skip ci]

Author: allcontributors[bot]

.all-contributorsrc

@@ -12920,6 +12920,15 @@
         "translation",
         "bug"
       ]
+    },
+    {
+      "login": "0xshikhar",
+      "name": "Shikhar Singh",
+      "avatar_url": "https://avatars.githubusercontent.com/u/64684053?v=4",
+      "profile": "https://github.com/0xshikhar",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,