chore(deps-dev): bump postcss-loader in /generators/client/templates/vue

Bumps [postcss-loader](https://github.com/webpack-contrib/postcss-loader) from 6.1.1 to 6.2.0.
- [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@v6.1.1...v6.2.0)

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

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

generators/client/templates/vue/package.json

@@ -54,7 +54,7 @@
     "numeral": "2.0.6",
     "postcss": "8.3.9",
     "postcss-import": "14.0.2",
-    "postcss-loader": "6.1.1",
+    "postcss-loader": "6.2.0",
     "postcss-url": "10.1.3",
     "rimraf": "3.0.2",
     "sass": "1.42.1",