Bump postcss-loader from 6.2.1 to 7.0.1

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 6.2.1 to 7.0.1.
- [Release notes](https://github.com/webpack-contrib/postcss-loader/releases)
- [Changelog](https://github.com/webpack-contrib/postcss-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/postcss-loader@v6.2.1...v7.0.1)

---
updated-dependencies:
- dependency-name: postcss-loader
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -79,7 +79,7 @@
 		"jest": "^28.1.1",
 		"module-replace-webpack-plugin": "0.0.12",
 		"postcss": "^8.4.14",
-		"postcss-loader": "^6.2.1",
+		"postcss-loader": "^7.0.1",
 		"raw-loader": "^4.0.2",
 		"vue-jest": "^3.0.7",
 		"workbox-webpack-plugin": "^6.5.3"