build(deps-dev): bump eslint-plugin-react in /boilerplate

Bumps [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) from 7.20.6 to 7.21.2.
- [Release notes](https://github.com/yannickcr/eslint-plugin-react/releases)
- [Changelog](https://github.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yannickcr/eslint-plugin-react/commits)

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

boilerplate/package.json

@@ -49,7 +49,7 @@
     "eslint": "^7.9.0",
     "eslint-config-prettier": "^6.11.0",
     "eslint-plugin-prettier": "^3.1.4",
-    "eslint-plugin-react": "^7.20.6",
+    "eslint-plugin-react": "^7.21.2",
     "eslint-plugin-react-hooks": "^4.1.2",
     "husky": "^4.3.0",
     "jest": "^26.4.2",

boilerplate/yarn.lock

@@ -5946,10 +5946,10 @@ eslint-plugin-react-hooks@^4.1.2:
   resolved "https://registry.yarnpkg.com/eslint-plugin-react-hooks/-/eslint-plugin-react-hooks-4.1.2.tgz#2eb53731d11c95826ef7a7272303eabb5c9a271e"
   integrity sha512-ykUeqkGyUGgwTtk78C0o8UG2fzwmgJ0qxBGPp2WqRKsTwcLuVf01kTDRAtOsd4u6whX2XOC8749n2vPydP82fg==
 
-eslint-plugin-react@^7.20.6:
-  version "7.20.6"
-  resolved "https://registry.yarnpkg.com/eslint-plugin-react/-/eslint-plugin-react-7.20.6.tgz#4d7845311a93c463493ccfa0a19c9c5d0fd69f60"
-  integrity sha512-kidMTE5HAEBSLu23CUDvj8dc3LdBU0ri1scwHBZjI41oDv4tjsWZKU7MQccFzH1QYPYhsnTF2ovh7JlcIcmxgg==
+eslint-plugin-react@^7.21.2:
+  version "7.21.2"
+  resolved "https://registry.yarnpkg.com/eslint-plugin-react/-/eslint-plugin-react-7.21.2.tgz#3bd5d2c4c36d5a0428d0d6dda301ac9a84d681b2"
+  integrity sha512-j3XKvrK3rpBzveKFbgAeGsWb9uz6iUOrR0jixRfjwdFeGSRsXvVTFtHDQYCjsd1/6Z/xvb8Vy3LiI5Reo7fDrg==
   dependencies:
     array-includes "^3.1.1"
     array.prototype.flatmap "^1.2.3"