fix(deps): update dependency @edx/frontend-platform to v8.4.0 (#431)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -7,7 +7,7 @@
   "dependencies": {
     "@edx/brand": "npm:@openedx/brand-openedx@^1.2.2",
     "@edx/frontend-component-footer-edx": "7.3.0",
-    "@edx/frontend-platform": "8.3.9",
+    "@edx/frontend-platform": "8.4.0",
     "@edx/gatsby-source-portal-designer": "^1.1.4",
     "@fortawesome/fontawesome-svg-core": "^6.7.2",
     "@fortawesome/free-brands-svg-icons": "^6.7.2",