chore(deps): update dependency postcss-import to v16

Author: renovate[bot]

package-lock.json

@@ -18,7 +18,7 @@
         "laravel-mix": "^6.0.49",
         "lodash": "^4.17.21",
         "postcss": "^8.4.23",
-        "postcss-import": "^15.1.0",
+        "postcss-import": "^16.0.0",
         "resolve-url-loader": "^5.0.0",
         "sass": "^1.63.4",
         "sass-loader": "^13.2.2",