Update macOS minimum deployment target from 10.15.0 to 10.15.4 #436
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Motivation
This will allow use of Swift-friendlier
Foundation.FileHandle
APIs in SwiftPM, which have an availability of 10.15.4. Because SourceKit-LSP uses libSwiftPM, it needs to have as new of a deployment target as SwiftPM does.This has no change in behavior in SourceKit-LSP, but will allow SwiftPM to increase its deployment target correspondingly.