Declare pip dependency for cli extras

[jonbiemond]

The pipdeptree package includes references to pip but does not explicitly require it.
To ensure pip is installed in a users environment, include it as a dependency.

Fixes #2203

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[jonbiemond]

pip's versioning scheme is year.quarter.patch. I arbitrarily chose to pin dependencies at >=24.0.0 or the earliest release of 2024.

[burnash]

Hey @jonbiemond, thank you for the fix and sorry for the delayed response. Could you please merge or rebase the dev branch and regenerate poetry.lock to fix conflicts?

[jonbiemond]

Hi @burnash, no worries! I've rebased and regenerated the lock file.

There are also two tests failing in CI. Now that pip is explicitly declared as an optional dependency, poetry install will remove it if it exists and when no extras are specified. These two tests rely on pip, which is why they now fail.

I've added a commit to include pip in the dev dependencies as well. This should resolve the failing tests. Alternatively all dependencies could be installed in CI with the --all-extras flag.