Bump docker/build-push-action from 5.3.0 to 5.4.0 #54

Job	Run time
shellcheck	6s
Run tests (gantry_cleanup_images_spec.sh)	2m 1s
Run tests (gantry_common_options_spec.sh)	1m 29s
Run tests (gantry_filters_spec.sh)	1m 14s
Run tests (gantry_login_spec.sh)	2m 6s
Run tests (gantry_manifest_spec.sh)	1m 51s
Run tests (gantry_notify_spec.sh)	1m 39s
Run tests (gantry_parallel_spec.sh)	2m 5s
Run tests (gantry_rollback_spec.sh)	1m 7s
Run tests (gantry_service_multiple_spec.sh)	1m 35s
Run tests (gantry_service_no_running_tasks_spec.sh)	1m 30s
Run tests (gantry_service_single_spec.sh)	1m 27s
Run tests (gantry_update_options_spec.sh)	1m 39s
	19m 49s

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