Latest Release 4.5.0 is not on Cocoapods yet

The [latest release for 4.5.0](https://github.com/google/GTXiLib/releases) was from July 29, 2021 but isn't available through Cocoapods.

The latest supported version is 4.4 as of now 
https://github.com/CocoaPods/Specs/tree/master/Specs/a/5/8/GTXiLib
