Key Vault FlexVolume is Deprecated

Hi,

This page points to using [Key Vault FlexVolume](https://github.com/Azure/kubernetes-keyvault-flexvol) which turns out to be DEPRECATED
Is it possible to point to an alternative? or just remove this reference!

Thanks,

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#### Document Details

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* ID: 22af16e4-3f97-9d4f-d95b-57fe152493b5
* Version Independent ID: 1c2ac810-3d67-614e-de7d-a050949642a3
* Content: [Centralized configuration](https://learn.microsoft.com/en-us/dotnet/architecture/cloud-native/centralized-configuration)
* Content Source: [docs/architecture/cloud-native/centralized-configuration.md](https://github.com/dotnet/docs/blob/main/docs/architecture/cloud-native/centralized-configuration.md)
* Product: **dotnet-architecture**
* Technology: **cloud-native**
* GitHub Login: @jamesmontemagno
* Microsoft Alias: **jamont**