Remove unused imports (June 2023)

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Time to time, I run pyflakes to find unused imports in the Python code base. That's the issue for June 2023 :-)

Linked PRs

• gh-105407: Remove unused imports in tests #105408
• gh-105407: Remove unused imports in Tools/ directory #105409
• gh-105407: Remove unused imports in Tools/c-analyzer/ #105410
• gh-105407: Remove unused imports in the stdlib #105411
• gh-105407: Remove unused imports #105554