Bump docker/build-push-action from 6.0.0 to 6.2.0 #57

Job	Run time
shellcheck	9s
Run tests (gantry_cleanup_images_spec.sh)	1m 55s
Run tests (gantry_common_options_spec.sh)	1m 39s
Run tests (gantry_filters_spec.sh)	1m 9s
Run tests (gantry_login_spec.sh)	1m 51s
Run tests (gantry_manifest_spec.sh)	1m 36s
Run tests (gantry_notify_spec.sh)	1m 37s
Run tests (gantry_parallel_spec.sh)	2m 2s
Run tests (gantry_rollback_spec.sh)	59s
Run tests (gantry_service_multiple_spec.sh)	1m 45s
Run tests (gantry_service_no_running_tasks_spec.sh)	1m 43s
Run tests (gantry_service_single_spec.sh)	1m 32s
Run tests (gantry_update_options_spec.sh)	6h 0m 14s
	6h 18m 11s

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