chore: bump eslint-plugin-react from 7.19.0 to 7.20.3 in /web

Bumps [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) from 7.19.0 to 7.20.3.
- [Release notes](https://github.com/yannickcr/eslint-plugin-react/releases)
- [Changelog](https://github.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md)
- [Commits](jsx-eslint/eslint-plugin-react@v7.19.0...v7.20.3)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

web/package.json

@@ -53,7 +53,7 @@
   "devDependencies": {
     "eslint": "6.6.0",
     "eslint-plugin-prettier": "3.1.3",
-    "eslint-plugin-react": "7.19.0",
+    "eslint-plugin-react": "7.20.3",
     "prettier": "2.0.5",
     "prettier-eslint": "9.0.1",
     "prettier-eslint-cli": "5.0.0",