[iOS] Compilation broken in Xcode 12.4 when using SPM

Our project compiled correctly in Xcode 12.4 up until November 23rd. After latest Zendesk SDK releases, it does not compile anymore.

We include dependencies using Swift Package Manager and setting them as "exact version".

After some investigation, we discovered some Zendesk SDK have inner dependencies to other Zendesk SDK. Those dependencies are defined in "Package.swift" using "from". This leads our ChatSDK 2.11.1 to download ChatProvidersSDK 2.11.2 and then compilation fails.