Bump postcss from 8.1.14 to 8.2.10 in /App

Bumps [postcss](https://github.com/postcss/postcss) from 8.1.14 to 8.2.10.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.1.14...8.2.10)

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

App/package.json

@@ -28,7 +28,7 @@
     "konva": "^7.2.0",
     "normalize.css": "^8.0.1",
     "parcel-bundler": "^1.12.4",
-    "postcss": "^8.1.14",
+    "postcss": "^8.2.10",
     "postcss-modules": "^4.0.0",
     "react": "^17.0.1",
     "react-bootstrap": "^1.4.0",