Fix sage math gf warnings#2

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hellman wants to merge 2 commits intoCryptoExperts:mainfrom

hellman:fix-SageMath-GF-warnings

Commits on Jun 14, 2024

skip sage tests if running without sage (requires pytest)
hellman
committed
fix SageMath's GF API (fetch_int / integer_representatino deprecated, replace with to_integer/from_integer)
hellman
committed