The repository indicates that it uses semantic versioning https://github.com/googlemaps/google-maps-ios-utils?tab=readme-ov-file#support

But version 6.1.1 introduced breaking changes since it requires iOS 16 instead of iOS 15 and uses maps SDK 10 instead of 9.
https://github.com/googlemaps/google-maps-ios-utils/releases/tag/v6.1.1

It should have been published as 7.0.0, not 6.1.1