chore: update actions

[radoering]

Summary by Sourcery

Update GitHub Actions workflows and composite actions to use newer major versions of upstream actions.

Build:

• Bump actions/checkout, actions/cache, actions/upload-artifact, actions/download-artifact, actions/setup-node, and actions/setup-python to their latest referenced versions across workflows and composite actions.
• Update dessant/lock-threads and actions/create-github-app-token to newer major releases in maintenance workflows.

[sourcery-ai]

Reviewer's Guide

This PR updates pinned versions (commit SHAs) of several GitHub Actions across workflows and composite actions to their latest major/minor releases, without changing workflow logic or behavior.

File-Level Changes

Change	Details	Files
Bump actions/checkout to v6.0.2 everywhere it is used.	Update all workflow jobs to reference actions/checkout@de0fac2 instead of the previous v5 commit SHA Ensure persist-credentials and other step configuration remain unchanged	.github/workflows/.tests-matrix.yaml .github/workflows/release.yaml .github/workflows/docs.yaml .github/workflows/tests.yaml
Upgrade caching-related actions to the latest major versions.	Update actions/cache from v4.2.4 to v5.0.2 in workflows and composite actions while keeping cache keys and paths the same Update actions/upload-artifact from v4.6.2 to v6.0.0 and actions/download-artifact from v5.0.0 to v7.0.0 in the release workflow, preserving artifact names and paths	.github/workflows/.tests-matrix.yaml .github/actions/poetry-install/action.yaml .github/workflows/release.yaml
Refresh language/runtime setup actions to newer versions.	Bump actions/setup-node from v5.0.0 to v6.2.0 in the docs workflow while keeping the Node version at 18 Bump actions/setup-python from v6.0.0 to v6.1.0 in the bootstrap-poetry composite action without changing inputs or outputs	.github/workflows/docs.yaml .github/actions/bootstrap-poetry/action.yaml
Update third-party maintenance actions to their latest major version.	Upgrade dessant/lock-threads from v5.0.1 to v6.0.0 for both issues and pull request locking jobs Upgrade actions/create-github-app-token from v2.1.1 to v2.2.1 in the backport workflow	.github/workflows/lock-threads.yaml .github/workflows/backport.yaml

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[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location> `.github/workflows/release.yaml:20-23` </location>
<code_context>
       - run: pipx run build

-      - uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
         with:
           name: distfiles
           path: dist/
</code_context>

<issue_to_address>
**suggestion:** Consider tightening upload-artifact behavior for missing files after the major version bump.

Given the major version bump of `actions/upload-artifact`, consider explicitly setting `if-no-files-found: error` (or your preferred behavior) so missing `dist/` artifacts fail the workflow rather than silently succeeding, and to avoid any surprises if defaults change in future versions.

```suggestion
      - uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
        with:
          name: distfiles
          path: dist/
          if-no-files-found: error
```
</issue_to_address>

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[github-actions]

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[github-actions]

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