Fix Embedded, bump 6.3 Swift toolchain in `test.yml` #2502

Job	Run time
build-examples	20m 15s
format	34s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 9s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	11m 2s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	11m 2s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	11m 4s
Build for native target (macos-15, Xcode_16.4)	2m 48s
prettier	12s
check-bridgejs-generated	2m 46s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 7s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	10m 46s
deploy-examples	0s
	1h 16m 45s

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