fix go module drifts for kubetest2-aks

Author: nilo19

kubetest2-aks/go.mod

@@ -2,7 +2,6 @@ module sigs.k8s.io/cloud-provider-azure/kubetest2-aks
 
 // Bump GoTool golang version in .pipelines if you change this
 go 1.24.6
-toolchain go1.24.6
 
 require (
 	github.com/Azure/azure-sdk-for-go/sdk/azcore v1.18.0