Update dependency postcss-nesting to v13 (#767)

Co-authored-by: renovate-04-kbuild[bot] <113478298+renovate-04-kbuild[bot]@users.noreply.github.com>

Author: renovate-04-kbuild[bot]

package-lock.json

@@ -65,7 +65,7 @@
     "postcss-custom-media": "11.0.0",
     "postcss-custom-properties": "13.3.12",
     "postcss-import": "16.1.0",
-    "postcss-nesting": "12.1.5",
+    "postcss-nesting": "13.0.0",
     "postcss-url": "10.1.3",
     "prettier-eslint": "16.3.0",
     "pretty": "2.0.0",