generously increase proxy timeout #1746

Job	Run time
test-getting_started / tests	1m 3s
test-tutorials (configuration.ipynb) / tests	1m 2s
test-tutorials (debugging.ipynb) / tests	1m 3s
test-tutorials (describing_tasks.ipynb) / tests	1m 4s
test-tutorials (multiple_pilots.ipynb) / tests	1m 2s
test-tutorials (profiling.ipynb) / tests	1m 2s
test-tutorials (raptor.ipynb) / tests	1m 2s
test-tutorials (raptor_mpi.ipynb) / tests	1m 1s
test-tutorials (staging_data.ipynb) / tests	1m 1s
test-tutorials (submission.ipynb) / tests	1m 2s
	10m 22s

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