Use mypy from pixi environment

[bouweandela]

Description

Use mypy from pixi environment

Pros

• More accurate because all dependencies are installed
• Manage only one environment (pixi) instead of two (pixi and pre-commit)
• No unexpected test breaking because pre-commit does not use lock files for its environments as in Tests failing - github actions pre-commit, mypy - error: "TypeAliasType" not callable #3117

Cons

• Does not work with pre-commit.ci
• A bit slower(?)

We could decide to move away from pre-commit.ci and instead just run the pre-commit hooks on CircleCI as part of the test suite. That would also have the advantage that it has one less CI service, so easier to understand for new contributors.

Link to documentation:

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• ☝ Create an issue to discuss what you are going to do

Checklist

It is the responsibility of the author to make sure the pull request is ready to review. The icons indicate whether the item will be subject to the 🛠 Technical or 🧪 Scientific review.

• 🧪 The new functionality is relevant and scientifically sound
• 🛠 This pull request has a descriptive title and labels
• 🛠 Code is written according to the code quality guidelines
• 🧪 and 🛠 Documentation is available
• 🛠 Unit tests have been added
• 🛠 Changes are backward compatible
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• 🛠 All checks below this pull request were successful

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.23%. Comparing base (353fbaf) to head (41de7c1).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3124   +/-   ##
=======================================
  Coverage   96.23%   96.23%           
=======================================
  Files         273      273           
  Lines       16132    16132           
=======================================
  Hits        15525    15525           
  Misses        607      607           

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[valeriupredoi]

thanks bud - a very welcome approach indeed! Approving preemptively (don't pull a Klaus on me since I approve drafts 😆 ) since I'll be away most next week