Bump css-loader from 3.1.0 to 3.2.0

Bumps [css-loader](https://github.com/webpack-contrib/css-loader) from 3.1.0 to 3.2.0.
- [Release notes](https://github.com/webpack-contrib/css-loader/releases)
- [Changelog](https://github.com/webpack-contrib/css-loader/blob/master/CHANGELOG.md)
- [Commits](webpack/css-loader@v3.1.0...v3.2.0)

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Author: dependabot-preview[bot]

core/js/dist/main.js

@@ -68,7 +68,7 @@
     "babel-loader": "^8.0.6",
     "babel-plugin-transform-es2015-arrow-functions": "^6.22.0",
     "browserslist-config-nextcloud": "0.0.1",
-    "css-loader": "^3.1.0",
+    "css-loader": "^3.2.0",
     "exports-loader": "^0.7.0",
     "file-loader": "^4.1.0",
     "handlebars-loader": "^1.7.1",