Build with Go 1.21

What does this MR do?

Build with Go 1.21

- Bump Go language version to 1.21.6 and fips version 1.21.5

Closes https://gitlab.com/gitlab-org/build/CNG/-/issues/1907

Signed-off-by: Robert Marshall <rmarshall@gitlab.com>

Related issues

Closes Build with Go 1.21 (#1907 - closed) • Robert Marshall • 16.9 • At risk

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

• Merge Request Title, and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com
• When ready for review, MR is labeled "~workflow::ready for review" per the Distribution MR workflow

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated
• New dependencies are managed with dependencies.io