Tidy up JavaScript

- Remove unneeded ujs and core-js
- Bump minimum versions in package.js to current versions. Turbo 7.3.1
  doesn't exist.
- Commit yarn.lock
- Remove unneeded babel config

Author: graemeboyd

babel.config.js

@@ -2,12 +2,10 @@
   "name": "whodat",
   "private": true,
   "dependencies": {
-    "@hotwired/stimulus": "^3.2.1",
-    "@hotwired/turbo": "^7.3.1",
-    "@rails/actioncable": "^6.0.0",
-    "@rails/activestorage": "^6.0.0",
-    "@rails/ujs": "^6.0.0",
-    "core-js": "^3.23.2"
+    "@hotwired/stimulus": "^3.2.2",
+    "@hotwired/turbo": "^8.0.13",
+    "@rails/actioncable": "^8.0.2",
+    "@rails/activestorage": "^8.0.2"
   },
   "version": "0.1.0",
   "devDependencies": {