Fix missing comma in @_expose attribute for SwiftSyntax602 #2036

Job	Run time
check-bridgejs-generated	2m 55s
Test BridgeJS against Swift versions (swift:6.2)	2m 55s
Test BridgeJS against Swift versions (swift:6.1.2)	2m 58s
build-examples	41m 55s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	17m 11s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	13m 4s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 56s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	14m 3s
format	30s
Build for native target (macos-15, Xcode_16.4)	3m 4s
deploy-examples	-1s
	1h 51m 30s

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