BridgeJS: Fix optionals build error with Embedded Swift #2609

Job	Run time
format	35s
check-bridgejs-generated	2m 32s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	2m 58s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 2s
Build for native target (macos-15, Xcode_16.4)	2m 12s
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 16s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	13m 33s
build-examples	20m 57s
prettier	8s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	10m 54s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	16m 8s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	12m 34s
deploy-examples	-1s
	1h 28m 48s

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