Add Swift 6.0 to CI matrix #1191

Job	Run time
Build for embedded target (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-...	45s
Build for native target (macos-14, Xcode_15.2)	15s
Build for native target (macos-15, Xcode_16)	16s
Build and Test (macos-12, wasm-5.9.1-RELEASE, Node, Xcode_13.4.1.app)	2m 1s
Build and Test (macos-13, wasm-5.9.1-RELEASE, Node, Xcode_14.3.app)	2m 12s
Build and Test (macos-14, wasm-5.9.1-RELEASE, Node, Xcode_15.2.app)	1s
Build and Test (ubuntu-22.04, wasm-5.9.1-RELEASE, Node)	1m 25s
Build and Test (ubuntu-22.04, wasm-5.10.0-RELEASE, Node)	1m 32s
Build and Test (ubuntu-20.04, wasm-5.8.0-RELEASE, Node)	2m 24s
Build and Test (ubuntu-20.04, wasm-5.10.0-RELEASE, Node)	1m 40s
Build and Test (ubuntu-20.04, wasm-5.8.0-RELEASE, MicroWASI)	2m 21s
Build and Test (ubuntu-20.04, wasm-5.9.1-RELEASE, MicroWASI)	1m 39s
Build and Test (ubuntu-20.04, wasm-5.10.0-RELEASE, MicroWASI)	1m 42s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	2m 40s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 24s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	1m 56s
	25m 13s

Provide feedback