net/gitlab-agent: Update distinfo

It seems that github again delivers different archives.
Therefor the checksums changed.
It is maybe required to download the files from
github.com/.../release/...

As reference I found many reported problems:
https://github.com/spack/spack/issues/5411
https://github.com/easybuilders/easybuild-easyconfigs/issues/5151
https://github.com/libgit2/libgit2/issues/4343

As the archives are generated on the fly, they can change at any time.
PR: 255423
Reported by: lysfjord.daniel@smokepit.net, pkg-fallout