Pin dependencies of Rucio containers

[rdimaio]

Rucio containers are mostly used in a server context, so it would be a good idea to pin all dependencies and images involved. Similar to rucio/rucio#6756

Ideally we would do these steps:

• Pin all dependencies involved
• Enable Scorecard to ensure no unpinned dependencies are added
• Enable integ testing on PRs for rucio/containers: Testing: Run rucio/rucio integ tests for PRs in rucio/containers #310
• Enable Dependabot for security updates (so that pinned dependencies get updated when there's security issues) - the integ test enabled in the prior step will confirm that the containers involved still build fine. As an alternative, it might be better to allow non-security updates for development dependencies, in order to not fall behind.