* Set Go version in go.mod
go mod edit -go=1.19
* Fix formatting issues reported by gofmt
* Fix SA1019 check (usage of deprecated "io/ioutil"), reported by golangci-lint
SA1019: "io/ioutil" has been deprecated since Go 1.16:
As of Go 1.16, the same functionality is now provided by package io or package os,
and those implementations should be preferred in new code.
See the specific function documentation for details. (staticcheck)
* Use Go 1.19 in our Dockerfiles
* Use Go 1.19 in the rpm-prepare.sh script
* Update the tag for the IBM Cloud CI image