Fix string lookup in get_versions
I initially changed this string then reverted to the original one, but forgot to change it here.
Before this fix:
| wmcs-k8s-metrics | chart | wmcs-metrics | wmcs-k8s-metrics-0.0.21-20241104102245-a6f60a0d | toolforge-deploy has wmcs-k8s-metrics- |
After this fix:
| wmcs-k8s-metrics | chart | wmcs-metrics | wmcs-k8s-metrics-0.0.21-20241104102245-a6f60a0d | |