Update dependency uuid to v8 (postcss#325)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

package.json

@@ -40,7 +40,7 @@
     "postcss-import": "^12.0.0",
     "prettier": "~2.0.0",
     "sugarss": "^2.0.0",
-    "uuid": "^7.0.0"
+    "uuid": "^8.0.0"
   },
   "files": [
     "bin",