Update dependency Microsoft.Data.SqlClient to 6.1.6

[dependencyupdates]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Microsoft.Data.SqlClient (source)	6.1.5 → 6.1.6

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Release Notes

dotnet/sqlclient (Microsoft.Data.SqlClient)

v6.1.6

This update brings the following changes since the 6.1.5 release.
See the full release notes for detailed descriptions.

Added

• Added Web Account Manager (WAM) broker support for the supported Entra ID authentication modes (Windows only), including the new ActiveDirectoryAuthenticationProviderOptions type with a UseWamBroker property, an ActiveDirectoryAuthenticationProvider(ActiveDirectoryAuthenticationProviderOptions options) constructor overload, and a cross-platform SetParentActivityOrWindowFunc(Func<object>) method.
  (#​4288,
  #​4387)

Changed

• Hardened TDS token parsing with data-length bounds checks to prevent unbounded memory allocation from a server spoofing length fields.
  (#​4340,
  #​4359)

• Updated dependencies (#​4387):

  • Updated Microsoft.Identity.Client to 4.84.2 (was 4.80.0)
  • Added Microsoft.Identity.Client.Broker 4.84.2

Fixed

• Fixed a NullReferenceException in SqlDataReader.GetChars on the PLP + SequentialAccess path when a null buffer was passed with a negative bufferIndex; it now throws ArgumentOutOfRangeException.
  (#​4159,
  #​4205)

• Fixed column master key (CMK) signature verification caching where a cached verification failure could subsequently be reported as a valid signature.
  (#​4339,
  #​4356)

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