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Drop Swift 5.4
Continuous of #523 and waiting for the new Xcode major to come out.
Motivation
- Xcode 13.3 requires macOS monterey
- macOS monterey runner in GitHub Actions doesn't have Xcode 12.x (https://github.com/actions/virtual-environments/blob/main/images/macos/macos-12-Readme.md#xcode)
- it means Swift 5.4 is not supported in macOS monterey runner.