all: add/bump tested Go versions
all: add/bump tested Go versions

Add 1.18.1.

Bump 1.16.0 -> 1.16.15, 1.17.3 -> 1.17.10.

Change-Id: Ic19b47004484970b404e4eb8b2d02955410f65af
Reviewed-on: https://go-review.googlesource.com/c/protobuf/+/406839
Reviewed-by: Damien Neil <7e091e9a80da888fcd7836fd3c6b7b85f4677c12@google.com>
Reviewed-by: Joseph Tsai <ad9e03fbec35106ba742f446a098eef3d5e31d20@digital-static.net>
Reviewed-by: Lasse Folger <c1a9282e9a97d9bcfa578c9e6643dbf90dcebfeb@google.com>

protocolbuffers/protobuf-go,protocolbuffers/protobuf-go