install/kubernetes: set right version on Makefile
install/kubernetes: set right version on Makefile

The Makefile contains all component versions which are then used to
generate the helm charts. This commit fixes some of those versions that
got out-of-sync with the right versions.

Fixes: 206105f4462c ("helm: use 'quay.io/cilium/certgen:v0.1.5'")
Fixes: 09f3c81920bd ("helm: upgrade envoy to v1.18.4 for hubble-ui")
Signed-off-by: André Martins <bc9800b9d52a24cce72a73dd528afed53f10e5fc@cilium.io>

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