test: Remove the kube-proxy dualstack fix
test: Remove the kube-proxy dualstack fix

We no longer run DualStack on kube-proxy-only job (i.e., the 4.9 job),
so we can remove the fix.

Signed-off-by: Martynas Pumputis <6b0d31c0d563223024da45691584643ac78c96e8@lambda.lt>

cilium/cilium,michi-covalent/cilium,cilium/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium