Update dependency cssnano to v7

Author: renovate[bot]

package.json

@@ -53,7 +53,7 @@
 		"create-pwa": "2.7.0",
 		"critical": "7.1.2",
 		"css-loader": "7.1.1",
-		"cssnano": "6.1.2",
+		"cssnano": "7.0.0",
 		"eslint": "9.1.1",
 		"eslint-config-prettier": "9.1.0",
 		"eslint-config-recommended": "4.1.0",