Drop Go 1.21 FIPS workaround
What does this MR do and why?
The Go 1.21 branch finally appeared (https://github.com/golang-fips/go/tree/go1.21-fips-release), so let's use it.
Currently the Gitaly UBI image is using Go 1.20.8:
$ docker run -it registry.gitlab.com/gitlab-org/gitlab-build-images/ubi-8.6-golang-1.21-rust-1.65:git-2.36 go version
go version go1.20.8 linux/amd64https://gitlab.com/gitlab-org/gitlab-build-images/-/jobs/5254449529 seems to have passed with the 1.21.1 patches.
Checklist
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(If applicable) Add patches if required for upgrading Ruby version in https://gitlab.com/gitlab-org/gitlab-build-images/-/tree/master/patches/ruby.
Edited by Stan Hu