CI: fix matrix testing on merge

[cadenmyers13]

The two failures are the Python 3.14 update to release-scripts and the path syntax differences between mac and windows. I pinned the matrix test to only run on 3.12 and 3.13 for now because of incompatibility (see this convo for more info: #65 (comment)).

Using .as_posix() converts all path objects to have the format path/to/wherever. This will convert the windows syntax which is outputting path\\to\\wherever, so this bug should be fixed.

closes #69

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.46%. Comparing base (87c1f43) to head (cfda207).
⚠️ Report is 30 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   83.27%   91.46%   +8.19%     
==========================================
  Files          12        3       -9     
  Lines        1351      164    -1187     
==========================================
- Hits         1125      150     -975     
+ Misses        226       14     -212     

Files with missing lines	Coverage Δ
tests/test_packsmanager.py	93.97% <100.00%> (+0.07%)	⬆️

... and 8 files with indirect coverage changes

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[cadenmyers13]

@sbillinge ready for review. I merged this into my fork to test and everything passed.

[sbillinge]

please see comments. You can be the first tester o the new release script.....

[sbillinge]

please could you remove this line. We have updated the release-scripts so this should pass tests without this now.

[sbillinge]

this shouldn't show up in the changelog. These are all just short-term developer things that will go away when we upgrade to 3.14. If no other behavior is changed in this PR (I see something being added to the tests) then this is a no-news news.

[github-actions]

Warning! No news item is found for this PR. If this is a user-facing
change/feature/fix,
please add a news item by copying the format from news/TEMPLATE.rst.
For best practices, please visit
https://scikit-package.github.io/scikit-package/frequently-asked-questions.html#billinge-group-standards.

[cadenmyers13]

@sbillinge I see that the new changes to the release-scripts read python version from pyproject.toml. Since we added python 3.14 support in an earlier PR i had to remove it. Im not sure why the earlier PR passed CI tests, though.

PS I removed the news item from the earlier PR as well, check for news must do a comparison with len(news.rglob(*)) or something like that, so thats why its failing despite there being a news item here.

[sbillinge]

Nice I merged. It failed news but that is ok