Update npm packages; a11y-dialog, axe-core, js-cookie (wagtail#10748)

- a11y-dialog (changes to event callbacks did not impact our usage) - https://a11y-dialog.netlify.app/migrating-to-v8/
- axe-core (minor update with a few improvements)
- js-cookie (breaking changes only relate to converters, which we do not use) - https://github.com/js-cookie/js-cookie/releases/tag/v3.0.0
- Closes wagtail#10718

package.json

@@ -106,16 +106,16 @@
   "dependencies": {
     "@hotwired/stimulus": "^3.2.1",
     "@tippyjs/react": "^4.2.6",
-    "a11y-dialog": "^7.4.0",
+    "a11y-dialog": "^8.0.0",
     "autosize": "^6.0.1",
-    "axe-core": "^4.6.2",
+    "axe-core": "^4.7.2",
     "downshift": "^7.2.0",
     "draft-js": "^0.10.5",
     "draftail": "^2.0.0-rc.6",
     "draftjs-filters": "^3.0.1",
     "focus-trap-react": "^8.4.2",
     "immer": "^9.0.6",
-    "js-cookie": "^2.2.1",
+    "js-cookie": "^3.0.5",
     "prop-types": "^15.6.2",
     "react": "^16.14.0",
     "react-dom": "^16.14.0",