fix(deps): update dependency react-instantsearch-dom to v6.21.0 (freeCodeCamp#44887)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

client/package.json

@@ -99,7 +99,7 @@
     "react-helmet": "6.1.0",
     "react-hotkeys": "2.0.0",
     "react-i18next": "11.15.3",
-    "react-instantsearch-dom": "6.20.0",
+    "react-instantsearch-dom": "6.21.0",
     "react-lazy-load": "3.1.13",
     "react-monaco-editor": "0.40.0",
     "react-redux": "5.1.2",