Bump react-dnd-html5-backend from 15.1.3 to 16.0.0 (#469)

Bumps [react-dnd-html5-backend](https://github.com/react-dnd/react-dnd) from 15.1.3 to 16.0.0.
- [Release notes](https://github.com/react-dnd/react-dnd/releases)
- [Changelog](https://github.com/react-dnd/react-dnd/blob/main/CHANGELOG.md)
- [Commits](https://github.com/react-dnd/react-dnd/commits/v16.0.0)

---
updated-dependencies:
- dependency-name: react-dnd-html5-backend
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -38,7 +38,7 @@
     "react": "^17.0.2",
     "react-autosize-textarea": "^7.1.0",
     "react-dnd": "^15.1.2",
-    "react-dnd-html5-backend": "^15.1.3",
+    "react-dnd-html5-backend": "^16.0.0",
     "react-dom": "^17.0.2",
     "react-google-recaptcha": "^2.1.0",
     "react-modal": "^3.14.4",