Remove bshephard

Signed-off-by: James Slagle <james.slagle@gmail.com>

Author: slagle

.github/CODEOWNERS

@@ -66,4 +66,4 @@ roles/ci_gen_kustomize_values/templates/uni* @openstack-k8s-operators/ciops
 roles/update @openstack-k8s-operators/updates
 
 # Validations
-roles/validations @bshephar @drosenfe
+roles/validations @drosenfe