change codecov action vars

[mshriver]

Summary by Sourcery

Enhance the GitHub Actions CI to generate and correctly upload coverage reports

CI:

• Add a step to generate coverage XML report for Python 3.12
• Update Codecov action input key from "file" to "files"

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Test workflow enhancements: adds a Python 3.12–specific coverage XML generation step and aligns the Codecov action with the updated 'files' parameter.

File-Level Changes

Change	Details	Files
Introduce a conditional step to generate coverage XML report on Python 3.12	Add 'Generate coverage XML report' step Apply 'if: matrix.python-version == "3.12"' condition Run 'hatch run test:coverage xml'	.github/workflows/tests.yml
Update Codecov action input key	Rename 'file' parameter to 'files' Verify coverage.xml path in the new key	.github/workflows/tests.yml

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[sourcery-ai]

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[Copilot]

Pull Request Overview

This PR enhances the CI/CD workflow to properly generate and upload test coverage reports to Codecov. The changes ensure that coverage data is explicitly generated in XML format before being uploaded.

• Adds an explicit step to generate coverage XML reports using hatch
• Corrects the codecov action parameter from file to files for proper file specification

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