Pin pip<23.1 and setuptools<67 to allow PEP-440 non compliance

[ajkavanagh]

PEP-440 is more strict about requirement lines. As an example:

pytz>dev

is non-compliant, but is in 5.2.4 of kombu's requirements. This breaks building wheelhouses from source (such as the octavia charm). This patch pins pip and setuptools to the latest versions that will defintely still allow PEP-440 non-compliant packages to install.

The option --upgrade-buildvenv-core-deps can be used to override this and will install the latest versions of pip and setuptools available.

Fixes-Bug: #652

Description of change

Checklist

• [x] Are all your commits [logically] grouped and squashed appropriately?
• [x] Does this patch have code coverage?
• [x] Does your code pass make test?

[ajkavanagh]

The integration test failure is unrelated to the change; sadly it looks like a networking issue within charmcraft.