Npgsql: Fix test cases to use async, stop relevant warnings #771
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Problem
The test suite started emitting such warnings the other day:
-- https://github.com/crate/cratedb-examples/actions/runs/12248712216
Solution
The patch has been created by making the flagged methods and their ingredients async, following corresponding advises by the .NET runtime, and then following relevant suggestions from the PyCharm IDE.