Make `JSObject` conform to `ExpressibleByDictionaryLiteral` #1363

Job	Run time
Build and Test (ubuntu-22.04, https://download.swift.org/swift-6.0.2-release/ubuntu2204/swift-6.0...	2m 9s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	2m 35s
Build for native target (macos-15, Xcode_16)	32s
Build and Test (ubuntu-22.04, https://download.swift.org/development/ubuntu2204/swift-DEVELOPMENT...	3m 15s
format	32s
	9m 3s

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