automation: use latest oVirt actions

[nyoxi]

Recently GitHub started failing on deprecated upload artifacts actions:

Error: This request has been automatically failed because it uses a deprecated version of `actions/upload-artifact: v2`. Learn more: https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/

[nyoxi]

@sandrobonazzola Build on el8 is not failing because mirrorlist.centos.org has been decommissioned and there is now a different scheme of resolving mirrors. Is this known issue? Any idea who could fix our base images?

+ dnf install -y autoconf automake make python3-coverage python3-libvirt python3-mock python3-six python3-devel git systemd dnf
Repository copr:copr.fedorainfracloud.org:ovirt:ovirt-master-snapshot is listed more than once in the configuration
CentOS Stream 8 - AppStream                     0.0  B/s |   0  B     00:00    
Errors during downloading metadata for repository 'appstream':
  - Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8-stream&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]
Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: Curl error (6): Couldn't resolve host name for http://mirrorlist.centos.org/?release=8-stream&arch=x86_64&repo=AppStream&infra=stock [Could not resolve host: mirrorlist.centos.org]

[sandrobonazzola]

You can just drop build on el8 as CentOS Stream 8 is EOL.

[sandrobonazzola]

LGTM