inferenceql.inference.gpm.view-test/simulate is flaky

The test `inferenceql.inference.gpm.view-test/simulate` is flaky. For example, it failed in [this test run](https://github.com/OpenIQL/inferenceql.inference/runs/6437271939?check_suite_focus=true#step:11:63), but later succeeded in [this one](https://github.com/OpenIQL/inferenceql.inference/runs/6437283512?check_suite_focus=true) without any code changes having been made.