Swift

Fixed a bug that caused `extendPagesConcurrently` to only return the … #347

Job	Run time
build_spotify_api_server	2m 43s
test_linux (swift:5.6)	1m 4s
test_macOS	5m 43s
build_watch_os_mac_catalyst (platform=watchOS Simulator,name=Apple Watch Series 8 (45mm),OS=10.0)	3m 44s
test_linux (swift:5.7)	4m 30s
build_watch_os_mac_catalyst (platform=macOS,variant=Mac Catalyst)	4m 36s
test_linux (swift:5.8)	4m 38s
test_linux (swift:5.9)	6m 2s
test_other_platforms (platform=iOS Simulator,name=iPhone 15,OS=17.0)	12m 25s
test_linux (swift:5.10)	6m 2s
test_other_platforms (platform=tvOS Simulator,name=Apple TV,OS=17.0)	9m 53s
	1h 1m 20s

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