Bump whatwg-fetch from 3.3.1 to 3.4.0 (#514)

Bumps [whatwg-fetch](https://github.com/github/fetch) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/github/fetch/releases)
- [Commits](JakeChampion/fetch@v3.3.1...v3.4.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -68,7 +68,7 @@
     "react-render-html": "^0.6.0",
     "react-router": "^5.2.0",
     "react-router-dom": "^5.1.2",
-    "whatwg-fetch": "^3.3.1"
+    "whatwg-fetch": "^3.4.0"
   },
   "engines": {
     "node": "~12.16",