Bump docker/build-push-action from 5.1.0 to 5.2.0 #46

Job	Run time
shellcheck	12s
Run tests (gantry_cleanup_images_spec.sh)	1m 57s
Run tests (gantry_common_options_spec.sh)	1m 32s
Run tests (gantry_filters_spec.sh)	1m 9s
Run tests (gantry_login_spec.sh)	1m 51s
Run tests (gantry_manifest_spec.sh)	1m 48s
Run tests (gantry_notify_spec.sh)	1m 34s
Run tests (gantry_parallel_spec.sh)	1m 59s
Run tests (gantry_rollback_spec.sh)	59s
Run tests (gantry_service_multiple_spec.sh)	1m 40s
Run tests (gantry_service_no_running_tasks_spec.sh)	1m 33s
Run tests (gantry_service_single_spec.sh)	1m 32s
Run tests (gantry_update_options_spec.sh)	1m 41s
	19m 27s

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