relax swift-syntax version constraint to allow 603 (#714) #2567

Job	Run time
build-examples	20m 3s
prettier	9s
format	34s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 26s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 25s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 58s
check-bridgejs-generated	2m 39s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 52s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 22s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	12m 35s
Build for native target (macos-15, Xcode_16.4)	2m 50s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 1s
deploy-examples	10s
	1h 33m 4s

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