Bump postcss from 7.0.35 to 8.2.10

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.35 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/7.0.35...8.2.10)

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

package.json

@@ -62,7 +62,7 @@
     "on-build-webpack": "^0.1.0",
     "optimize-css-assets-webpack-plugin": "^5.0.4",
     "pako": "^1.0.11",
-    "postcss": "^7.0.35",
+    "postcss": "^8.2.10",
     "postcss-loader": "^3.0.0",
     "postcss-preset-env": "^6.7.0",
     "qr-code-styling": "^1.3.4",