Traefik 3 Support in Uitsmijter 0.10.3

Traefik 3 uses a new ApiVersion for Kubernetes manifests.
traefik.containo.us/v1alpha1 is replaced with traefik.io/v1alpha1.
Uitsmijter 0.10.3 will support the new ApiVersion by default.

Backward compadibility is given: Use the apiVersion you have installed in the uitsmijter values.yaml:

traefik:
  apiVersion: traefik.containo.us/v1alpha1

We would like to investigate the new APIGateway to become provider agnostic some time before 1.0.0.