fix: add missing postcss-import dependency

Author: saade

package-lock.json

@@ -15,7 +15,8 @@
         "npm-run-all": "^4.1.5",
         "postcss": "^8.4.31",
         "postcss-cli": "^10.1.0",
-        "postcss-nesting": "^12.0.0"
+        "postcss-import": "^16.0.1",
+        "postcss-nesting": "^12.0.2"
     },
     "dependencies": {
         "treeselectjs": "^0.10.0"