[6.0] Upgrade to ICU 74 (#39) #42
Merged
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Explanation: upgrade SwiftFoundationICU to 74, which aligns with macOS Sonoma
Scope: update code and data file to ICU 74
Original PR: #40
Risk: Medium - while this is a big change, it's the same code we already shipped https://github.com/apple-oss-distributions/ICU and tested internally
Testing: Testing done via local SwiftPM tests and swift-ci tests, including passing toolchain build for Windows and Linux for SwiftCorelibsFoundation
Reviewer: @itingliu