⬆️ Update checkout action from v5 to v6 in all workflows

[tsvikas]

Update actions/checkout from v5 to v6 across all GitHub workflow files in both the repository and template to use the latest version.

Files updated:

• .github/workflows/uv-tests.yml
• project_name/.github/workflows/ci.yml.jinja
• project_name/.github/workflows/weekly-ci.yml.jinja
• project_name/.github/workflows/build-and-publish.yml.jinja

Summary by Sourcery

CI:

• Bump actions/checkout from v5 to v6 across all CI, test, and publish workflows, including the project template workflows.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR bumps all usages of the GitHub Actions checkout action from v5 to v6 across the main repo workflow and the project template workflows, without changing any other workflow behavior or configuration.

File-Level Changes

Change	Details	Files
Upgrade actions/checkout from v5 to v6 in the root repository workflow.	Update the pre-commit job to use actions/checkout@v6 while preserving persist-credentials: false. Update the uv-tests matrix job to use actions/checkout@v6 while preserving existing uv setup and test steps.	.github/workflows/uv-tests.yml
Upgrade actions/checkout from v5 to v6 in the project CI workflow template.	Change all CI jobs (format-python, ruff-check, pre-commit, mypy, dependencies) to use actions/checkout@v6. Update all test matrix jobs to use actions/checkout@v6 while keeping environment, setup-uv, and pytest steps unchanged. Ensure the coverage upload job continues to use the same configuration with actions/checkout@v6.	project_name/.github/workflows/ci.yml.jinja
Upgrade actions/checkout from v5 to v6 in the weekly CI workflow template.	Update the weekly tests job to use actions/checkout@v6 while keeping timeout and uv setup intact. Update the additional weekly job (e.g., dependency or extra checks) to use actions/checkout@v6 with unchanged steps and timeouts.	project_name/.github/workflows/weekly-ci.yml.jinja
Upgrade actions/checkout from v5 to v6 in the build-and-publish workflow template.	Change the build-and-publish job to use actions/checkout@v6 before running the build-and-inspect-python-package action, keeping all other job configuration the same.	project_name/.github/workflows/{% if in_pypi %}build-and-publish.yml{% endif %}.jinja

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[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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