Remove unused import sys

[Copilot]

Description of your changes:

Removed unused import sys from docs/source/conf.py. The module was imported but never referenced.

Which issue is resolved by this Pull Request:
Resolves #

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[scylla-operator-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[mflendrich]

closing - will retry with a copilot instructions file