test(dev): update black version CVE-2024-21503

[reubenmiller]

Proposed changes

Resolved security alert about a test-only dependency. https://github.com/thin-edge/thin-edge.io/security/dependabot/18. This has no effect on thin-edge.io itself, as black is only used by devs to format the test code which is written in python.

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

https://github.com/thin-edge/thin-edge.io/security/dependabot/18

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
428	0	3	428	100	0s