[v2.9] Update go.mod for QA task 1118

[markusewalker]

Issue: Post release Checks on a RKE1 cluster provisioning is Failing

Problem

When running the RKE1 custom cluster provisioning tests, there is a specific check for the etcdctl version. When running the DynamicInput tests, this passes. For the static TDD tests, they fail.

Troubleshooting, it is because the etcd node has the private IP address in the external AND internal IP address for only the static tests; the dynamic tests do not share this problem.

Solution

This PR complements the shepherd PR to ensure the go.mod and go.sum files are updated as expected.

Testing

Engineering Testing

Automated Testing

Automated runs will be provided to the reviewers offline.