Adds base64 dependency: base64 was added to the gemspec, since starting in Ruby 3.4.0, base64 will no longer be part of the default gems and will no longer be in the standard library.
Base64 is used for API key and Cloud ID. The dependency used to be declared in transport, but it's not needed there since the implementation using it is in this codebase. It was removed from transport in the latest patch releases: 8.1.3, 8.2.5 and 8.3.1.