fix: resolve ruff lint errors (E402, F401, F821)
- check_versions.py: restore correct file (import re was placed before shebang causing E402 for all following imports; missing 'client' in kubernetes import causing F821 at line 236) - request_upgrades.py: remove unused 're' import and unused 'client' from kubernetes import (only 'config' is needed here) - web.py: remove unused 'os' import
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