chore(deps): update dependency postcss to v8.4.49

Author: renovate[bot]

package.json

@@ -26,7 +26,7 @@
     "gulp-cli": "2.3.0",
     "gulp-purgecss": "5.0.0",
     "gulp-sass": "5.1.0",
-    "postcss": "8.4.38",
+    "postcss": "8.4.49",
     "postcss-cli": "11.0.0",
     "prejss-cli": "0.3.3",
     "rollup": "4.18.0",