chore(deps): update dependency stimulus to v3

Author: renovate-bot

package.json

@@ -51,7 +51,7 @@
     "regenerator-runtime": "0.13.9",
     "sass": "1.42.1",
     "sass-loader": "12.1.0",
-    "stimulus": "2.0.0",
+    "stimulus": "3.0.0",
     "stylelint": "13.13.1",
     "stylelint-config-standard": "22.0.0",
     "url-loader": "4.1.1",