Bump image-webpack-loader from 4.6.0 to 6.0.0

Bumps [image-webpack-loader](https://github.com/tcoopman/image-webpack-loader) from 4.6.0 to 6.0.0.
- [Release notes](https://github.com/tcoopman/image-webpack-loader/releases)
- [Changelog](https://github.com/tcoopman/image-webpack-loader/blob/master/CHANGELOG.md)
- [Commits](tcoopman/image-webpack-loader@v4.6.0...v6.0.0)

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

package.json

@@ -20,7 +20,7 @@
     "glob-all": "^3.1.0",
     "html-loader": "^0.5.5",
     "html-webpack-plugin": "^3.2.0",
-    "image-webpack-loader": "^4.6.0",
+    "image-webpack-loader": "^6.0.0",
     "jquery": "^3.4.1",
     "mini-css-extract-plugin": "^0.5.0",
     "optimize-css-assets-webpack-plugin": "^5.0.0",