Have automated CI that bumps observability (at least) libs

[orfeas-k]

Context

The observability libraries (as with every library) can stay for long without update since it's a chore that we have to do manually. Observability team let me know that they have CI that bumps those automatically in their charms. This is integrated like this in each charm's repo and uses this workflow essentially.
Options are to:

• Keep this scoped to only observability libs (probably covered by this workflow)
• Extend it for all our charm libs

This way, we 'll avoid staying behind when there are no breaking changes and having to do chores for bumping those in the future.

What needs to get done

Implement CI for bumping libraries as described above.

Definition of Done

There is CI that bumps (open PRs) for new versions of libraries.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5605.

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[orfeas-k]

Should take into account #849.