BridgeJS: Fix optionals build error with Embedded Swift #2608

Job	Run time
format	34s
check-bridgejs-generated	2m 52s
Build for native target (macos-15, Xcode_16.4)	2m 46s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	2m 48s
prettier	8s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 31s
build-examples	4m 30s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	2m 48s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 12s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	4m 1s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	3m 26s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 30s
deploy-examples	1s
	32m 7s

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