Add Deno checkPrime fix reference

[cookesan]

Adds the upstream merge commit for denoland/deno#34391 to GHSA-9xg4-qhm4-g43w.

Evidence checked:

• PR #34391 merged as commit b7e72335c0c5c935d94cfeeda8cba992642653e9.
• The v2.8.1 fixed tag contains that merge commit, and the release notes name #34391 as the minimum Miller-Rabin rounds fix for checkPrime.
• The commit clamps Miller-Rabin rounds to FIPS 186-4 minimums when the caller passes zero and adds regression coverage for composite values that pass trial division.
• The crates.io deno 2.8.1 package depends on deno_runtime 0.257.0, deno_node 0.187.0, and deno_node_crypto 0.19.0; the deno_node_crypto 0.19.0 source package contains the fixed primes.rs code and tests.