Add Swift 6.0 to CI matrix #1194

Job	Run time
Build for embedded target (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-...	53s
Build and Test (macos-12, wasm-5.9.1-RELEASE, Node, Xcode_13.4.1.app)	19m 10s
Build and Test (macos-13, wasm-5.9.1-RELEASE, Node, Xcode_14.3.app)	4m 48s
Build for native target (macos-14, Xcode_15.2)	18s
Build and Test (macos-14, wasm-5.9.1-RELEASE, Node, Xcode_15.2.app)	1m 57s
Build for native target (macos-15, Xcode_16)	16s
Build and Test (ubuntu-22.04, wasm-5.9.1-RELEASE, Node)	4m 1s
Build and Test (ubuntu-22.04, wasm-5.10.0-RELEASE, Node)	1m 41s
Build and Test (ubuntu-20.04, wasm-5.8.0-RELEASE, Node)	15m 24s
Build and Test (ubuntu-20.04, wasm-5.10.0-RELEASE, Node)	8m 27s
Build and Test (ubuntu-20.04, wasm-5.8.0-RELEASE, MicroWASI)	1m 23s
Build and Test (ubuntu-20.04, wasm-5.9.1-RELEASE, MicroWASI)	1m 40s
Build and Test (ubuntu-20.04, wasm-5.10.0-RELEASE, MicroWASI)	1m 33s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	2m 2s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 13s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 29s
	1h 8m 15s

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