fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692

package.json

@@ -92,7 +92,7 @@
 		"mini-css-extract-plugin": "^2.5.1",
 		"node-sass": "6.0.1",
 		"pnp-webpack-plugin": "^1.7.0",
-		"postcss": "^8.4.5",
+		"postcss": "^8.4.31",
 		"postcss-flexbugs-fixes": "^5.0.2",
 		"postcss-loader": "^6.2.1",
 		"postcss-normalize": "^10.0.1",
@@ -116,7 +116,7 @@
 		"react-switch": "^6.0.0",
 		"react-use-measure": "^2.1.1",
 		"resolve": "^1.21.0",
-		"resolve-url-loader": "^4.0.0",
+		"resolve-url-loader": "^5.0.0",
 		"sanitize-html": "^2.6.0",
 		"sass-loader": "10.2.1",
 		"semver": "^7.3.5",