Golang upgrades

Jenkins X codebase uses Golang/Go. New versions of golang comes every 6 months, and golang supports only 2 versions. It is highly desireable to use the latest and greatest version of golang for Jenkins X as newer versions have performance improvements and get regular security updates.

To update golang version in Jenkins X follow these steps

• Open an issue in jx repository announcing the upgrade.
• Change the go version in the pipeline catalog repository. See this PR for which files to change.
• Update the catalog version in the version stream See this PR for which files to change.
• Update the library packages first (please follow this order)
  • jx-kube-client
  • go-scm
  • logrus-stackdriver-formatter
  • jx-logging
  • jx-api
  • jx-helpers
  • secretfacade
• Once these packages are upgraded, start the upgrade for the plugins and main jx repository
• Follow these steps to upgrade the version
  • Change the version in go.mod file
  • Run go mod tidy and ensure that it does not error out
  • Change GO_VERSION in makefile to the version you are upgrading to.
  • Check if there are any references to an older version and replace those.
  • Verify that
    • the build works by running make build
    • tests are working, by running make test
    • linting checks are working by running make lint

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