Bump css-loader from 6.11.0 to 7.0.0 in /{{cookiecutter.project_slug}}

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 6.11.0 to 7.0.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/css-loader/compare/v6.11.0...v7.0.0)

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

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

{{cookiecutter.project_slug}}/package.json

@@ -9,7 +9,7 @@
     "babel-loader": "^9.1.2",
     "bootstrap": "^5.2.3",
     "browser-sync": "^3.0.2",
-    "css-loader": "^6.5.1",
+    "css-loader": "^7.0.0",
     "gulp-concat": "^2.6.1",
     "concurrently": "^8.0.1",
     "cssnano": "^6.0.0",