team-carmen example uses the wrong/outdated default branch

[spkane]

The repo https://github.com/CarmenAPuccio/GeoLocationAPI that is used for the team-carmen workload example has changed its default branch from master to main. This needs to be fixed in a few places:

• https://github.com/aws-samples/eks-blueprints-workloads/blob/main/envs/dev/templates/team-carmen.yaml#L16
• https://github.com/aws-samples/eks-blueprints-workloads/blob/main/envs/test/templates/team-carmen.yaml#L15