Upgrade operator go sdk to 1.29.0

[edif2008]

The steps performed to upgrade the Operator SDK for Go from 1.25.0 to 1.29.0 were the following:

• Update dependencies in Makefile and config/default/manager_auth_proxy_patch.yaml.

No Go mod dependencies were updated for the following reasons:

• According to the upgrade to v1.28.0, we needed the following version for the following packages, which we already have or are higher:

  k8s.io/api v0.26.2 
  k8s.io/apiextensions-apiserver v0.26.2 
  k8s.io/apimachinery v0.26.2 
  k8s.io/client-go v0.26.2 
  k8s.io/kubectl v0.26.2 
  sigs.k8s.io/controller-runtime v0.14.5 

• Updating these to the latest version (v0.27.3 as of this writing) seems to break building the operator with the following error:

  # k8s.io/client-go/applyconfigurations/meta/v1
  vendor/k8s.io/client-go/applyconfigurations/meta/v1/unstructured.go:64:38: cannot use doc (variable of type *"github.com/google/gnostic/openapiv2".Document) as *"github.com/google/gnostic-models/openapiv2".Document value in argument to proto.NewOpenAPIData
  

These are based on the steps presented in upgrading to v1.28.0, since that is the version that has changes relevant to a Go operator (which is our case).