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

Author: renovate[bot]

package-lock.json

@@ -61,7 +61,7 @@
     "minimist": "1.2.8",
     "mkdirp": "1.0.4",
     "nets": "3.2.0",
-    "postcss-import": "12.0.1",
+    "postcss-import": "16.1.0",
     "postcss-simple-vars": "5.0.2",
     "react": "16.14.0",
     "react-dom": "16.14.0",