Add cosl to requirements.in, remove juju_topology, when bumping prometheus-scrape charm lib to revision 40

[ca-scribner]

Context

the prometheus-scrape charm lib added a requirement for the cosl package to be installed by the charm. When we bump the library, we need to add this package otherwise the charm will be inoperable.

What needs to get done

here is an example of the changes required. Steps to fix this are:

charmcraft fetch-lib
tox -e update-requirements
rm lib/charms/observability_libs/v0/juju_topology.py

Definition of Done

When all charms we have are using the updated libs. This likely will occur during the 1.9 release cycle

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5467.

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[orfeas-k]

In that PR, my understanding is that the following comment is wrong and cosl comes from prometheus scrape as the issue describes

# from observability_libs.v0.juju_topology.py
cosl

Also, bumping requirements should happen with

pip-compile requirements.in -P cosl -o requirements.txt

(same for unit)

[orfeas-k]

We can use this as a reference for instructions when we need to update more charms' libraries but closing it, since it doesn't serve any purpose being open.