fix(deps): update dependency postcss-rtlcss to v4 (#359)

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

Author: renovate[bot]

package-lock.json

@@ -67,7 +67,7 @@
     "postcss": "8.4.23",
     "postcss-custom-media": "^9.1.2",
     "postcss-loader": "7.3.0",
-    "postcss-rtlcss": "3.7.2",
+    "postcss-rtlcss": "4.0.6",
     "react-dev-utils": "12.0.1",
     "react-refresh": "0.14.0",
     "resolve-url-loader": "5.0.0",