Bump the docker/metadata-action in our metadata action to v5.
We should refactor this repo's CI to be more like the cluster api provider packet CI. There is no reason to use this custom composite metadata action anymore.
Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/kubernetes-sigs/cloud-provider-equinix-metal/blob/main/OWNERS)~~ [cprivitere]
Approvers can indicate their approval by writing `/approve` in a comment
Approvers can cancel approval by writing `/approve cancel` in a comment
Bump the docker/metadata-action in our metadata action to v5.
We should refactor this repo's CI to be more like the cluster api provider packet CI. There is no reason to use this custom composite metadata action anymore.