Bump System.Text.Json from 8.0.5 to 9.0.0 in /examples #174

Job	Run time
linux-cuda	0s
macos-coreml	0s
linux-openvino	0s
windows-cuda	0s
windows-openvino	0s
windows-vulkan	0s
linux / native-build	1m 56s
linux-no-avx / native-build	1m 10s
android / native-build	1m 40s
macos / arm-native-build	2m 30s
macos / intel-native-build	51s
wasm / native-build	58s
windows / arm-native-build	1m 33s
windows / intel-native-build	1m 18s
windows-no-avx / native-build	2m 7s
dotnet-build / dotnet-macos	2m 1s
dotnet-maui-build-and-test / dotnet-maui-build	4m 5s
dotnet-build / dotnet-windows	3m 22s
dotnet-build / dotnet-linux	1m 15s
dotnet-maui-build-and-test / dotnet-maui-test-android	4m 52s
	29m 38s

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