Update dependency postcss to v8.5.20 [skip netlify] (#1521)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -56,7 +56,7 @@
 		"eslint-config-prettier": "10.1.8",
 		"globals": "17.7.0",
 		"npm-run-all2": "9.0.2",
-		"postcss": "8.5.19",
+		"postcss": "8.5.20",
 		"postcss-cli": "11.0.1",
 		"postcss-inline-svg": "6.0.0",
 		"prettier": "3.8.5",