Bump System.Memory from 4.5.5 to 4.6.0 in /examples #172

Job	Run time
linux-cuda	0s
linux-openvino	0s
macos-coreml	0s
windows-cuda	0s
windows-vulkan	0s
windows-openvino	0s
android / native-build	1m 28s
linux / native-build	1m 57s
linux-no-avx / native-build	1m 6s
macos / arm-native-build	2m 23s
macos / intel-native-build	57s
wasm / native-build	51s
windows / arm-native-build	1m 41s
windows / intel-native-build	1m 17s
windows-no-avx / native-build	1m 42s
dotnet-build / dotnet-linux	1m 7s
dotnet-build / dotnet-macos	1m 56s
dotnet-build / dotnet-windows	4m 15s
dotnet-maui-build-and-test / dotnet-maui-build	3m 17s
dotnet-maui-build-and-test / dotnet-maui-test-android	4m 48s
	28m 45s

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