'IClientConfig.DetermineServiceURL()' is obsolete

[ramonsmits]

The following PR resolved an obsolete compiler warning by suppressing it:

• https://github.com/Particular/NServiceBus.AmazonSQS/pull/1707

The obsolete message:

[CS0618] 'IClientConfig.DetermineServiceURL()' is obsolete: 'This operation is obsoleted because as of version 3.7.100 endpoint is resolved using a newer system that uses request level parameters to resolve the endpoint.'

The following commit introduced the obsolete but it is not obvious how to migrate the code:

• https://github.com/aws/aws-sdk-net/commit/4547258dea36273227edc5723894d602e632ae1e