Update dependency stylelint to v13.12.0

Author: renovate-bot

package-lock.json

@@ -10,7 +10,7 @@
     "jest": "26.6.3",
     "postcss-cli": "8.3.0",
     "postcss-reporter": "6.0.1",
-    "stylelint": "13.11.0",
+    "stylelint": "13.12.0",
     "stylelint-config-standard": "20.0.0",
     "supertest": "6.1.3"
   },