Update minimum recommended version to 3.57.0

[Meghana-Palaparthi]

The current recommended .Net SDK version is 3.57.0 as per Azure/azure-cosmos-dotnet-v3 changelog

[learn-build-service-prod-01]

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[learn-build-service-prod]

Learn Build status updates of commit 4cb9a42:

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File	Status	Preview URL	Details
azure/cosmos-db/sdk-dotnet-v3.md	✅Succeeded

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