Increase parallel connection limit for iOS #1843

Job	Run time
PSV.Linux.22.04.gcc9.Tests.CodeCov	9m 58s
PSV.Linux.22.04.gcc11	7m 52s
PSV.Linux.20.04.gcc7.Cpplint	8m 7s
PSV.Linux.20.04.gcc7.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 16s
PSV.Linux.22.04.gcc13	12m 13s
PSV.Commit.Checker	7s
PSV.Linux.20.04.clang	7m 35s
PSV.MacOS14.Xcode15	3m 24s
PSV.Linux.Android.20.04	5m 16s
PSV.Linux.22.04.gcc13.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	8m 5s
PSV.MacOS13.Xcode16	4m 2s
PSV.iOS.MacOS13.Xcode15	10m 1s
PSV.iOS.MacOS13.Xcode14	9m 39s
PSV.iOS.MacOS13.Xcode16	4m 56s
PSV.iOS.MacOS14.Xcode15	11m 23s
PSV.Linux.22.04.gcc11.OLP_SDK_ENABLE_DEFAULT_CACHE=OFF	2m 3s
PSV.MacOS13.Xcode15.x86_64	5m 29s
PSV.Win.VC2019	11m 9s
	2h 3m 35s

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