message: objc: Preparing for 1.2.0-rc3 release.
  GitOrigin-RevId:
diff: +Version 1.2.0-rc3
  +==================================
  +Added Swift-friendly initializers for TinkRegistryConfig.
  +Support for generating keys for ECIES and ECDSA.
  +Removed some deprecated APIs.
  +This is a pre-release version.
  +
  Version 1.2.0-rc2
  ==================================
  Small bug fixes and support for the iOS keychain. This is a pre-release version.
  