[Lint] Reformat with latest black version

[MHHukiewitz]

Problem: new version of black invalidates prior formatting

Solution: update black and reformat files

[github-actions]

Rationale:

• 'examples' directory contains small refactoring of Python code which is unlikely to cause issues.
• The PR also includes minor adjustments in some files under 'src/aleph/sdk', these changes are likely to be minimal and do not introduce new bugs or have a high risk.

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