BridgeJS: Fix memory management of SwiftHeapObject #2380

Job	Run time
Test BridgeJS against Swift versions (swift:6.2, 602.0.0)	3m 10s
prettier	15s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	7m 10s
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.1-release/ubuntu2204/swift-6.1-R...	7m 6s
Test BridgeJS against Swift versions (swift:6.1.2, 601.0.0)	3m 5s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	7m 7s
Build for native target (macos-15, Xcode_16.4)	2m 26s
build-examples	7m 6s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	7m 6s
format	33s
check-bridgejs-generated	2m 40s
deploy-examples	1s
	47m 45s

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