fix(security): upgrade crossbeam-epoch from 0.9.18 to 0.9.20

[hyperpolymath]

Fixes RUSTSEC-2026-0204: Invalid pointer dereference in fmt::Pointer impl for Atomic and Shared when the underlying pointer is invalid.

Upgrades crossbeam-epoch from 0.9.18 to 0.9.20 to resolve the security vulnerability detected by cargo audit.

Resolves: #89

[coderabbitai]

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