Un-pin dependency `pint <= 0.17`

[LauWien]

Description of PR

This PR un-pins the dependency pint <= 0.17, which got introduced in #589. Closes #638.

[codecov[bot]]

Codecov Report

Merging #639 (345ee8a) into main (56b97d0) will not change coverage. The diff coverage is n/a.

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  Files         57      57           
  Lines       5663    5663           
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  Hits        5357    5357           
  Misses       306     306           

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[danielhuppmann]

So the failing test reminded me why I didn't remove the pin at the time. Can you please insert minimum requirements for pint and iam-units and update the legacy-dependency test?

Please also add a section "## Dependency changes" to the release notes?

[danielhuppmann]

The legacy-dependency tests specifically takes the oldest supported version of several important packages, to make sure that our information on "oldest supported version" is actually correct.

If you look at the log of the GitHub action workflow, it first installed pint 0.17, and then installed pyam - but because pint 0.17 is not in line with the stated pyam requirements, it actually installed the latest version of pint (currently 0.18).

[LauWien]

More importantly: there was no functional change, so I suspect that the current codebase is actually compatible with pint 0.17 (or even earlier). Did you check? The iam-units seems to be backward-compatible back to pint 0.11.

Ah I see, what I checked before is, that with https://github.com/IAMconsortium/units/releases/tag/v2021.11.12 iam-units was made compatible with pint version 0.18, but checking the setup.cfg this should be right as you say, compatible back to pint 0.11. So I would then again remove the minimum dependency on pint as well as then pint==0.18 in the legacy-dependency test, leave the minimum dependency on iam-units >= 2021.11.12 and change the legacy-dependency test to iam-units==2021.11.12. What do you think?

[LauWien]

Superseded by https://github.com/IAMconsortium/pyam/pull/640.