re-upgrade headless UI w/ positioning fixes

The issue in #138 (fixed by #139) was the result of positioning the
listbox using tailwind classes instead of the `Listbox`'s own attrs for
positioning. Using the builtin positioning option seems to have fixed
this even on the latest version.

package.json

@@ -5,7 +5,7 @@
   "type": "module",
   "dependencies": {
     "@dagrejs/dagre": "^1.1.4",
-    "@headlessui/react": "2.1.1",
+    "@headlessui/react": "^2.1.3",
     "@headlessui/tailwindcss": "^0.2.1",
     "@heroicons/react": "^2.1.5",
     "@tailwindcss/typography": "^0.5.15",