⬆️ Bump clean-css from 4.2.1 to 4.2.2 (#683)

Bumps [clean-css](https://github.com/jakubpawlowicz/clean-css) from 4.2.1 to 4.2.2.
- [Release notes](https://github.com/jakubpawlowicz/clean-css/releases)
- [Changelog](https://github.com/jakubpawlowicz/clean-css/blob/master/History.md)
- [Commits](clean-css/clean-css@v4.2.1...v4.2.2)

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

package.json

@@ -103,7 +103,7 @@
     }
   },
   "dependencies": {
-    "clean-css": "4.2.1",
+    "clean-css": "4.2.2",
     "electron": "7.1.10",
     "electron-builder": "^22.2.0",
     "electron-rebuild": "1.8.8",