chore(deps): update dependency cssnano to v6.0.4

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
     "autoprefixer": "10.4.16",
     "clsx": "1.2.1",
     "cookie": "0.5.0",
-    "cssnano": "6.0.1",
+    "cssnano": "6.0.4",
     "ioredis": "5.3.2",
     "jsonwebtoken": "9.0.2",
     "next": "12.3.4",