AlmaLinux 9 image for CI

[mmikhasenko]

Update recommended image for CI.

cc7 is getting deprecated at CERN,
Page of documentation that list images is https://linux.web.cern.ch/dockerimages/

[welcome]

Thanks for opening your first pull request here 🚀! If you have any questions, feel free to mention one of the conveners, previous contributors, or attend our weekly meeting (see
our homepage). Also, sometimes PRs go unnoticed, so don't hesitate to @mention some of us, if we do not come back to you within a few days.

[jonas-eschle]

Thanks for the fix @mmikhasenko, can be merged as soon as the CI passes

[welcome]

Congrats on merging your first pull request 🎉! We greatly appreciate it.
You might be eligible to be added to the HSF Training Community page (see the instructions on the page for how to create a profile). If you already have created a profile previously, make sure you're also added to the current year. If this repository features a list of contributors at the bottom of the readme, you might also be eligible to add yourself there.

[mmikhasenko]

thanks for merging quickly. Danm CI (actually latex compilation in CI) killed most of today ❌ still unsolved. At least something useful out of this activity