update deps

package.json

@@ -28,13 +28,14 @@
     "url": "https://github.com/jenil/chota/issues"
   },
   "devDependencies": {
-    "autoprefixer": "^9.6.1",
+    "autoprefixer": "^10.4.8",
     "cross-env": "^7.0.2",
-    "cssnano": "^4.1.7",
+    "cssnano": "^5.1.13",
     "npm-run-all": "^4.1.5",
-    "postcss-cli": "^7.1.1",
-    "postcss-csso": "^4.0.0",
-    "postcss-import": "^12.0.1",
+    "postcss": "^8.4.16",
+    "postcss-cli": "^10.0.0",
+    "postcss-csso": "^6.0.1",
+    "postcss-import": "^15.0.0",
     "rimraf": "^3.0.0"
   },
   "files": [