Update dependency Microsoft.Data.SqlClient to 7.0.3

[dependencyupdates]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.Data.SqlClient (source)	7.0.2 → 7.0.3

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Release Notes

dotnet/sqlclient (Microsoft.Data.SqlClient)

v7.0.3

Changed

• Updated the Microsoft.Data.SqlClient.SNI and Microsoft.Data.SqlClient.SNI.runtime dependencies to 6.0.3 (was 6.0.2).
  (#​4599)

Fixed

• Fixed a SqlBulkCopy regression in environments where the application login cannot read sys.all_columns. Bulk copy now falls back to the earlier column-discovery behavior when that permission is unavailable. Support for hidden columns and SQL Graph column aliases still requires access to the metadata view.
  (#​4370, #​4306, #​4402)

• Fixed a memory-allocation regression in connection and command operations caused by formatting diagnostic strings even when tracing was disabled. Also corrected trace messages that reported an incorrect object ID or could throw FormatException when traced values contained braces.
  (#​4528, #​4533)

• Fixed ServerCertificate validation on the managed SNI path so the configured certificate is compared against the server certificate even when the server certificate passes chain and host-name validation. When certificate validation is enabled, a missing, unreadable, or invalid certificate file, a certificate mismatch, or a missing server certificate now causes the TLS handshake to fail instead of bypassing the configured certificate check. (net8.0/net9.0 only)
  (#​4445, #​4583)

• Fixed Always Encrypted VSM/HGS enclave attestation to verify that the enclave public key used to establish a session matches the key committed to by the signed attestation report. Missing, malformed, or mismatched key-binding data now causes attestation to fail before the session secret is derived.
  (#​4532, #​4553)

• Fixed SqlConnection.AccessTokenCallback not disabling Transparent Network IP Resolution by default, making it consistent with SqlConnection.AccessToken. An explicitly configured TransparentNetworkIPResolution connection-string value still takes precedence. (net462 only)
  (#​4520, #​4561)

• Fixed authentication state handling so clearing SqlConnection.AccessToken, AccessTokenCallback, or SspiContextProvider preserves the other authentication values in the connection pool key. Cloning a connection or updating its credential also preserves its SspiContextProvider. Combining a non-null SspiContextProvider with AccessToken or AccessTokenCallback now throws InvalidOperationException instead of silently discarding authentication state; applications must use one authentication mechanism at a time.
  (#​4520, #​4561, #​4644)

• Fixed configurable retry logic installing a permanent, process-wide assembly-resolution handler that could interfere with unrelated assembly loading. The handler is now active only while an explicitly configured custom retry provider is resolved and constructed, and probes AppContext.BaseDirectory instead of the current working directory. Place custom retry assemblies in the application base directory; dependencies loaded after provider construction must be resolvable through normal application dependency resolution or an application-provided handler. (net8.0/net9.0 only)
  (#​2214, #​4547, #​4663)

Companion packages

• Released Microsoft.Data.SqlClient.Extensions.Azure 7.0.3 with the Entra ID authority parsing fix for Dataverse/Dynamics 365 connections. See release notes.
• Released version-aligned Microsoft.Data.SqlClient.AlwaysEncrypted.AzureKeyVaultProvider, Microsoft.Data.SqlClient.Extensions.Abstractions, and Microsoft.Data.SqlClient.Internal.Logging 7.0.3 with no functional or API changes. See the Azure Key Vault provider, Abstractions, and Logging release notes.

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