Use Go to 1.21.6 and 1.20.13 to build

Robert Marshallrequested to merge
support-golang-1-21 into master

What does this MR do and why?

Use Go to 1.21.6 and 1.20.13 to build
    
- Upgrades the version of the Go language to 1.21.6 and 1.20.13
- Removes deprecated Go language versions 1.18 and 1.19
    
Related https://gitlab.com/gitlab-org/gitlab-build-images/-/issues/135
    
Signed-off-by: Robert Marshall <rmarshall@gitlab.com>

Related Drop unused Go versions from images (#135 - closed) • Robert Marshall • 16.9 • On track

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Edited by Robert Marshall

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