images/scripts: remove golang-alpine image update
images/scripts: remove golang-alpine image update

The golang-alpine image is no longer used since commit 2960b4e6fd63
("images: Move hubble-proto into cilium-builder"). Remove the
corresponding update step from update-golang-image.sh.

Signed-off-by: Tobias Klauser <059b8b880f8441509ec8a65b50b4c6ae74ebea76@cilium.io>

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