.github/workflows: remove `go version` commands from golangci-lint job
.github/workflows: remove `go version` commands from golangci-lint job

These commands were used to debug why Go 1.16 wasn't used while working
on #15080, but weren't removed before submitting.

Fixes: 3e0fcd4fb0b9 (".github/workflows: update golangci-lint GitHub action for Go 1.16 support")
Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

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