Bump peter-evans/dockerhub-description from 3 to 4 #37

Job	Run time
shellcheck	7s
Run tests (gantry_cleanup_images_spec.sh)	1m 40s
Run tests (gantry_entrypoint_spec.sh)	50s
Run tests (gantry_job_spec.sh)	50s
Run tests (gantry_login_spec.sh)	1m 53s
Run tests (gantry_manifest_spec.sh)	1m 48s
Run tests (gantry_multiple_services_spec.sh)	1m 36s
Run tests (gantry_no_running_tasks_spec.sh)	1m 10s
Run tests (gantry_options_spec.sh)	1m 31s
Run tests (gantry_rollback_spec.sh)	1m 4s
Run tests (gantry_simple_spec.sh)	1m 38s
	14m 7s

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