ci: update test matrix to Python 3.10-3.12, fix torch version

[Jayant-kernel]

Fixes #85. The CI workflow was running on Python 3.8 despite pyproject.toml declaring requires-python >=3.10. Also updates the torch installation from the unsupported 1.8.1+cpu to 2.3.0+cpu and bumps actions/checkout and actions/setup-python to latest versions.

Describe your changes

The .github/workflows/ci-tests.yml workflow was configured to run on Python 3.8, which is not a supported interpreter per pyproject.toml (requires-python = ">=3.10"). This means CI was validating an unsupported Python version and potentially missing failures on supported ones.

Changes made:

• Added a strategy.matrix to run tests on Python 3.10, 3.11, and 3.12
• Updated torch installation from torch==1.8.1+cpu to torch==2.3.0+cpu (compatible with torch>=2.3.0 declared in optional deps)
• Bumped actions/checkout from v2 to v4 and actions/setup-python from v2 to v5

No new dependencies required.

Issue Link

Closes #85

Type of change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📖 Documentation (Addition or improvements to documentation)

Checklist before requesting a review

• My branch is up-to-date with the target branch
• I have performed a self-review of my code
• For any new/modified functions/classes I have added docstrings that clearly describe its purpose, expected inputs and returned values
• I have placed in-line comments to clarify the intent of any hard-to-understand passages of my code
• I have updated the documentation to cover introduced code changes
• I have added tests that prove my fix is effective or that my feature works
• I have given the PR a name that clearly describes the change, written in imperative form
• I have requested a reviewer and an assignee

[Jayant-kernel]

@leifdenby
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