Merge branch '649-make-golang-1-20-the-default' into 'main'

Make golang 1.20 the default for gitlab-shell development and CI

Closes #649

See merge request https://gitlab.com/gitlab-org/gitlab-shell/-/merge_requests/750



Merged-by: Patrick Bajao <ebajao@gitlab.com>
Approved-by: Patrick Bajao <ebajao@gitlab.com>
Reviewed-by: Patrick Bajao <ebajao@gitlab.com>
Co-authored-by: Ash McKenzie <amckenzie@gitlab.com>

.gitlab-ci.yml

@@ -10,7 +10,7 @@ include:
 variables:
   DOCKER_VERSION: "20.10.15"
   BUNDLE_FROZEN: "true"
-  GO_VERSION: "golang-1.18"
+  GO_VERSION: "golang-1.20"
   DEBIAN_VERSION: "bullseye"
   RUBY_VERSION: "ruby-3.2"