chore(deps-dev): bump postcss from 8.1.14 to 8.2.1

Bumps [postcss](https://github.com/postcss/postcss) from 8.1.14 to 8.2.1.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.1.14...8.2.1)

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

package.json

@@ -53,7 +53,7 @@
     "autoprefixer": "^10.0.4",
     "babel-preset-react-app": "^10.0.0",
     "cypress": "^6.0.1",
-    "postcss": "^8.1.14",
+    "postcss": "^8.2.1",
     "postcss-nested": "^5.0.2",
     "prettier": "2.2.1",
     "prop-types": "^15.7.2",