Updated the 'PromisesObjC' dependency to '~> 2.3' and 'GoogleUtilities/Environment' to '~> 7.11' in AppCheckCore.podspec. These match the the version ranges specified in Package.swift.
The App Check Core unit tests still have a dependency on Firebase Core (specifically, FirebaseCoreExtension). Updated the imports to framework-style <>, instead of "", since they are coming from the dependency rather than looking for a local path (different repo).
Updated the version from 10.13.0 to 0.1.0-alpha.1 to reflect the pre-release status.