test: fix flaky pika integration test — poll basic_get instead of imm… #42

Job	Run time
Static analysis (ruff + mypy)	44s
Broker integration (Redis · RabbitMQ · SQS)	1m 18s
Conformance suite in sync	3s
Python 3.10	23s
Python 3.13	20s
Python 3.9	25s
Python 3.11	17s
Python 3.12	23s
CI green	2s
	3m 55s

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