Increase default resource values for gitaly

the values for gitaly are causing intermittent performance, increasing them in K3d values allowed for consistent results in testing for gitlab-runner used these values in k3d/values.yaml - would be a good starting point

addons:
  gitlab:
    values:
      gitlab:
        gitaly:
          resources:
            requests:
              cpu: 400m
              memory: 600Mi
            limits:
              cpu: 400m
              memory: 600Mi