Update dependency @gitlab/stylelint-config to v3

package.json

@@ -208,7 +208,7 @@
   "devDependencies": {
     "@babel/plugin-transform-modules-commonjs": "^7.10.1",
     "@gitlab/eslint-plugin": "10.0.0",
-    "@gitlab/stylelint-config": "2.6.0",
+    "@gitlab/stylelint-config": "3.0.0",
     "@graphql-eslint/eslint-plugin": "3.0.0",
     "@testing-library/dom": "^7.16.2",
     "@vue/test-utils": "1.3.0",