Use an explicit connector for Azure backend services.

[pragmatrix]

With the update of tokio-websockets the Azure connection attempts failed with:

Could not automatically determine the process-level CryptoProvider from Rustls crate features.
Call CryptoProvider::install_default() before this point to select a provider manually, or make sure exactly one of the 'aws-lc-rs' and 'ring' features is enabled.

The solution to that is to make the crypto provider / connector explicit.