Bump Xcode to 12.5

[uhooi]

References

Official

• https://developer.apple.com/documentation/xcode-release-notes/xcode-12_5-release-notes
• https://developer.apple.com/documentation/ios-ipados-release-notes/ios-ipados-14_5-release-notes
• https://github.com/apple/swift/blob/main/CHANGELOG.md#swift-54

SwiftPM

• https://twitter.com/tanakasan2525/status/1385069556654215170?s=20

Firebase

• https://github.com/firebase/firebase-ios-sdk/blob/master/SwiftPackageManager.md
• https://twitter.com/temoki/status/1384692550955458566?s=20

Mockolo

• https://github.com/uber/mockolo/releases/tag/1.4.0
• https://github.com/uber/mockolo/issues/142

Others

• https://twitter.com/tanakasan2525/status/1384704621000552457?s=20
• https://twitter.com/tanakasan2525/status/1384706150608769024?s=20

[github-actions[bot]]

👋 Thanks for reporting! Please PR :)