Add Deno checkPrime advisory references

[cookesan]

Adds Deno checkPrime advisory references to GHSA-9xg4-qhm4-g43w.

Audit refresh, July 8, 2026:

• Confirmed the live PR is open, ready for review, merge-clean, and the visible advisory check is green.
• Rechecked the merge-base diff: exactly one advisory JSON file changes (advisories/github-reviewed/2026/06/GHSA-9xg4-qhm4-g43w/GHSA-9xg4-qhm4-g43w.json), JSON parses, git diff --check passes, and the exact-head worktree is clean.
• Revalidated the added public references in the diff; the GitHub commit and release resolve directly, and the NVD CVE page was manually verified after the automated fetch timed out.

[cookesan]

Rechecked this reference-only PR while keeping the open Advisory Database queue current.

Adds direct NVD, commit, and release references for GHSA-9xg4-qhm4-g43w. The advisory already references upstream PR #34391 and package source; this PR links the merged fix to the fixed Deno release and records the NVD publication timestamp.

Current audit, July 8, 2026:

• GHSA-9xg4-qhm4-g43w is live and not withdrawn.
• CVE-2026-49440 resolves in NVD with Analyzed status and published timestamp 2026-06-23T18:18:03.563.
• PR #34391 merged to main as commit b7e72335c0c5c935d94cfeeda8cba992642653e9.
• Release v2.8.1 is published and not marked draft or prerelease.
• crates.io deno 2.8.1 resolves and is not yanked.
• Local JSON validation and whitespace checks pass, and the diff only changes this advisory.

Only references and NVD publication metadata are changed.