Release v4.7.8

• Deployment will wait until Julien is back from holidays (>25 July).
• Julien will create deployment ticket.

Public release

• CI green for public release, even with Xrootd 5.
• When we tag it, it will be built and pushed against our repo.
• After that, we need to publish to the public repo and announce to the community.
• To be done on week (>25 July).
• Versioning will follow the format v5.Y.Z, where Y and Z are the same numbers as the internal release with Xrootd 4. We will only release v5.Y.Z versions when deemed appropriate.