golang: Drop support for Go1.14
This Go release is EOL now. Don't drop support for Go1.12 and Go1.13 yet. Even though those Go releases are also EOL since long ago, they are still being used inside SlapOS: Go1.12 - by gitlab (/cc @jerome, @alain.takoudjou) Go1.13 - by galène (/cc @tomo, @alain.takoudjou)
Thank you guys for this and galène.
If we need one more reason to have someone allocated to update gitlab, our software release is no longer installable. As we can see in test output:
Your bundle is locked to mimemagic (0.3.0), but that version could not be found in any of the sources listed in your Gemfile. If you haven't changed sources, that means the author of mimemagic (0.3.0) has removed it. You'll need to update your bundle to a version other than mimemagic (0.3.0) that hasn't been removed in order to install.
the version also appear as removed from https://rubygems.org/gems/mimemagic/versions