Upgrade language version to 9.0 or higher

Azure / AppConfiguration-DotnetProvider

The .NET Standard configuration provider for Azure App Configuration

https://github.com/Azure/AppConfiguration

MIT License

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Upgrade language version to 9.0 or higher #498

Closed amerjusupovic closed 5 months ago

amerjusupovic commented 10 months ago

Init-only properties are not supported in C# language version 8.0, which is the version currently in the provider. This should be updated to at least 9.0 so we can use it for properties in AzureAppConfigurationOptions like FeatureFilterTracing.