fix: upgrade @types/react from 17.0.20 to 17.0.21 (#508)

Snyk has created this PR to upgrade @types/react from 17.0.20 to 17.0.21.

See this package in npm:
https://www.npmjs.com/package/@types/react

See this project in Snyk:
https://app.snyk.io/org/lukemnet/project/31f4df4e-4e87-4525-a2e6-31950e541955?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

package.json

@@ -10,7 +10,7 @@
     "@testing-library/user-event": "13.2.1",
     "@types/jest": "26.0.24",
     "@types/node": "^16.9.1",
-    "@types/react": "17.0.20",
+    "@types/react": "17.0.21",
     "@types/react-beautiful-dnd": "13.1.2",
     "@types/react-dom": "17.0.9",
     "@types/react-router-dom": "5.1.9",