Turned out I got it the wrong way at first.
Here’s the working format (you can see this implemented in the same file):
acf.add_action('change_field_type', function ($el) {
});
I checked your site and it seems like it is already loading the places library and the search is working.
Your script misses to load the places library from google api. Either you have to check if there’s an option to enable google.maps.places.Autocomplete in the script you have or add the missing file.
Check here:
https://developers.google.com/maps/documentation/javascript/places#loading_the_library