WHY
We want to use the latest available version of Go

WHAT
Versions of Go in upstream and midstream for 3scale operator and 3scale Apicast Operator should be updated to latest available

HOW
Update Go version in go mod of upstream repo
Update Go version in Openshift releases (possibly)
Update Go version of go toolset in the midstream repository

TESTS
Upstream - PR tests pass

DONE
3scale operator is using go 1.20
3scale Apicast operator is using go 1.20