Revert ".gitlab-ci.yml: Use current Fedora 34 instead rawhide"
This reverts commit ec02b1a9
The CI should pass. If the CI fails with this error:
Error: Error downloading packages:
Curl error (6): Couldn't resolve host name for https://mirrors.fedoraproject.org/metalink?repo=rawhide&arch=x86_64 [getaddrinfo() thread failed to start]
then there is a problem with the seccomp filters used to run the container image. See https://bugzilla.redhat.com/show_bug.cgi?id=1985499 for details.