chore(deps): update dependency cssnano to v7

Author: renovate[bot]

package.json

@@ -54,7 +54,7 @@
     "babel-polyfill": "6.26.0",
     "c8": "7.14.0",
     "core-js": "3.46.0",
-    "cssnano": "5.1.15",
+    "cssnano": "7.1.2",
     "eslint": "8.23.1",
     "eslint-config-prettier": "8.5.0",
     "eslint-plugin-prettier": "4.2.1",