thanos: bump to latest and add `thanosPrometheusCommonDimensions`

This commit pulls latest changes from thanos mixins and sets `thanosPrometheusCommonDimensions`
to `namespace, pod` for k8s use case.

Refer https://github.com/thanos-io/thanos/pull/4508

 for more details.

Signed-off-by: Arunprasad Rajkumar <arajkuma@redhat.com>