chore: update dependency postcss-nested to v7

Author: renovate[bot]

package-lock.json

@@ -54,7 +54,7 @@
     "npm-run-all2": "7.0.2",
     "postcss": "8.5.3",
     "postcss-less": "6.0.0",
-    "postcss-nested": "6.2.0",
+    "postcss-nested": "7.0.2",
     "postcss-scss": "4.0.9",
     "remark-cli": "11.0.0",
     "remark-preset-lint-consistent": "5.1.2",