[swift5][client] fix URLSession warning of URLSessionProtocol conformance

Created by: 4brunu

This PR fixes the warning Sendability of function types in instance method 'dataTask(with:completionHandler:)' does not match requirement in protocol 'URLSessionProtocol'.

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@jgavris (2017/07) @ehyche (2017/08) @Edubits (2017/09) @jaz-ah (2017/09) @4brunu (2019/11)

Merged by: 4brunu at 2022-11-04 17:09:14 UTC

closed

changed milestone to %6.3.0