fix(deps): upgrade oras-go to v2.6.1 and remove registry-1 workaround

oras-go v2.6.1 fixes ServerAddressFromRegistry to correctly normalize
registry-1.docker.io to https://index.docker.io/v1/. The Login() function
had a redundant ServerAddressFromHostname call added as a workaround for
that oras-go v2.6.0 bug. Remove it now that the upstream fix is in place.

Fixes #31386

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Signed-off-by: GitHub Copilot <copilot@github.com>

go.mod

@@ -47,7 +47,7 @@ require (
 	k8s.io/client-go v0.36.1
 	k8s.io/klog/v2 v2.140.0
 	k8s.io/kubectl v0.36.1
-	oras.land/oras-go/v2 v2.6.0
+	oras.land/oras-go/v2 v2.6.1
 	sigs.k8s.io/controller-runtime v0.24.1
 	sigs.k8s.io/kustomize/kyaml v0.21.1
 	sigs.k8s.io/yaml v1.6.0

go.sum

@@ -507,8 +507,8 @@ k8s.io/kubectl v0.36.1 h1:96HqS9twIdHM0MlJLTwbo14b9kUKPkOzZ4tlRDLv4qI=
 k8s.io/kubectl v0.36.1/go.mod h1:/DGPAIewKsFWF9VFgGvkPhao2Ev4SNuE3BioZo8yPbk=
 k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2 h1:AZYQSJemyQB5eRxqcPky+/7EdBj0xi3g0ZcxxJ7vbWU=
 k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2/go.mod h1:xDxuJ0whA3d0I4mf/C4ppKHxXynQ+fxnkmQH0vTHnuk=
-oras.land/oras-go/v2 v2.6.0 h1:X4ELRsiGkrbeox69+9tzTu492FMUu7zJQW6eJU+I2oc=
+oras.land/oras-go/v2 v2.6.1 h1:bonOEkjLfp8tt6qXWRRWP6p1F+9octchOf2EqnWB4Zs=
-oras.land/oras-go/v2 v2.6.0/go.mod h1:magiQDfG6H1O9APp+rOsvCPcW1GD2MM7vgnKY0Y+u1o=
+oras.land/oras-go/v2 v2.6.1/go.mod h1:dhtFrFOuZuDtAVeZ9FUnaa5zfzplG3ZnFX9/uH1J/Yk=
 sigs.k8s.io/controller-runtime v0.24.1 h1:miPEwrmirImAvgME1L9qebGHrOnGJoVmVdtOU9fRfo4=
 sigs.k8s.io/controller-runtime v0.24.1/go.mod h1:vFkfY5fGt5xAC/sKb8IBFKgWPNKG9OUG29dR8Y2wImw=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5EXP7sU1kvOlxwZh5txg=

pkg/registry/client.go

@@ -266,7 +266,6 @@ func (c *Client) Login(host string, options ...LoginOption) error {
 	c.authorizer.ForceAttemptOAuth2 = false
 
 	key := credentials.ServerAddressFromRegistry(host)
-	key = credentials.ServerAddressFromHostname(key)
 	if err := c.credentialsStore.Put(ctx, key, cred); err != nil {
 		return err
 	}