Update optimize-css-assets-webpack-plugin requirement

Updates the requirements on [optimize-css-assets-webpack-plugin](https://github.com/NMFR/optimize-css-assets-webpack-plugin) to permit the latest version.
- [Release notes](https://github.com/NMFR/optimize-css-assets-webpack-plugin/releases)
- [Commits](NMFR/optimize-css-assets-webpack-plugin@v5.0.1...v5.0.3)

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

Author: dependabot-preview[bot]

package.json

@@ -62,7 +62,7 @@
     "jest-cli": "26.0.1",
     "mini-css-extract-plugin": "0.5.0",
     "node-sass": "4.14.0",
-    "optimize-css-assets-webpack-plugin": "5.0.1",
+    "optimize-css-assets-webpack-plugin": "5.0.3",
     "sass-loader": "7.3.1",
     "style-loader": "0.23.1",
     "webpack": "4.29.6",