ci: build on golang 1.18
Bumping go version to 1.18 but still testing with 1.17 (as well as 1.19) as suggested in !171 (comment 1148182689)
Edited by Alessio Caiazza
Bumping go version to 1.18 but still testing with 1.17 (as well as 1.19) as suggested in !171 (comment 1148182689)