Bump Wasm and Musl Swift SDKs to 6.2.3 #901

Job	Run time
build-xcode	4m 28s
build-musl (6.2-noble, https://download.swift.org/swift-6.2.3-release/static-sdk/swift-6.2.3-RELE...	3m 22s
check-autogen-diff	54s
build-wasi	1m 38s
build-windows	6m 54s
build-android (nightly-6.3)	5m 11s
build-linux (swiftlang/swift:nightly-6.3-noble)	6m 18s
build-linux (swift:6.2-amazonlinux2)	4m 14s
build-macos (Xcode_16.2)	3m 48s
build-linux (swift:6.1-noble)	5m 42s
build-linux (swift:6.2-noble)	5m 34s
build-macos (Xcode_26.1)	8m 6s
build-android (nightly-main)	5m 8s
build-android (6.2)	6m 4s
build-macos (Xcode_16.4)	10m 26s
build-cmake	1m 5s
build-linux (swift:6.0-jammy)	5m 14s
deploy-dev-dashboard	-1s
	1h 24m 5s

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