Update Microsoft.Data.SqlClient minimal version dependency to 7.0.0

[tmasternak]

This issue tracks work that should be done to update the minimal version to 7.0.0 of Microsoft.Data.SqlClient.

This will go into a new major due to breaking changes in the client. See the upgrade guide for details:

• NServiceBus.SqlTransport version 9 to 10 upgrade guide docs.particular.net#8182

The work done:

• NServiceBus.SqlTransport version 9 to 10 upgrade guide docs.particular.net#8182
• https://github.com/Particular/NServiceBus.SqlServer/milestone/89
• Update dependency Microsoft.Data.SqlClient to v7 #1694