Increase parallel connection limit for iOS #1842

Job	Run time
PSV.Linux.22.04.gcc9.Tests.CodeCov	10m 6s
PSV.Linux.20.04.gcc7.Cpplint	8m 8s
PSV.MacOS14.Xcode15	3m 36s
PSV.iOS.MacOS13.Xcode16	6m 59s
PSV.Linux.22.04.gcc13	12m 8s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	6m 49s
PSV.MacOS13.Xcode16	3m 4s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 15s
PSV.Linux.22.04.gcc11	8m 4s
PSV.iOS.MacOS13.Xcode15	10m 15s
PSV.Linux.20.04.clang	7m 49s
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 35s
PSV.iOS.MacOS13.Xcode14	11m 17s
PSV.Linux.Android.20.04	5m 34s
PSV.MacOS13.Xcode15.x86_64	4m 38s
PSV.Win.VC2019	11m 25s
PSV.iOS.MacOS14.Xcode15	11m 28s
PSV.Commit.Checker	8s
	2h 6m 18s

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