Bump actions/setup-node from 6 to 7 #2764

Job	Run time
check-bridgejs-generated	3m 31s
Test BridgeJS against Swift versions (swift:6.3, 603.0.0)	3m 24s
format	35s
Build for native target (macos-15, Xcode_26.0.1)	3m 9s
Build and Test (ubuntu-24.04, https://download.swift.org/swift-6.3-branch/ubuntu2404/swift-6.3-DE...	13m 20s
Build and Test (ubuntu-24.04, https://download.swift.org/development/ubuntu2404/swift-DEVELOPMENT...	15m 48s
build-examples (Basic)	9m 53s
build-examples (OffscrenCanvas)	10m 8s
build-examples (Embedded)	10m 22s
build-examples (PlayBridgeJS)	12m 21s
build-examples (ActorOnWebWorker)	10m 7s
prettier	12s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	21m 7s
build-examples (Multithreading)	10m 22s
build-examples-deploy	0s
deploy-examples	-1s
	2h 4m 18s

Provide feedback