Autopkgtests timing out on unstable (ci.debian.net)

debusine's autopkgtests are failing on most archs due to timeouts.

This is a combination of #1065 and some other issues:

https://ci.debian.net/packages/d/debusine/testing/ppc64el//64719061/ :
- debian/tests/integration-tests-workflow-debian-pipeline.py::IntegrationWorkflowDebianPipelineTests::test_debian_pipeline
- debusine/server/worker_pools/tests/test_models.py::TestAWSEC2LaunchTemplate::test_network_interfaces_device_indices

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