Drop Swift 6.0 support #1903

Job	Run time
check-bridgejs-generated	5m 18s
Build for native target (macos-15, Xcode_16.4)	1m 27s
build-examples	11m 26s
format	34s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	5m 39s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	5m 8s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	6m 42s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	5m 37s
deploy-examples	0s
	41m 51s

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