Add Tornado redirect fixed release references

[cookesan]

Adds Tornado redirect fixed release references to GHSA-3x9g-8vmp-wqvf.

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-3x9g-8vmp-wqvf/GHSA-3x9g-8vmp-wqvf.json), JSON parses, git diff --check passes, and the exact-head worktree is clean.
• Revalidated the added public references and package-version evidence in the diff; all resolve through their source site or registry.

[cookesan]

Review note: this expands GHSA-3x9g-8vmp-wqvf with the upstream Tornado redirect fix commit, v6.5.6 tag, and PyPI package evidence while leaving the affected PyPI range, CVSS score, alias, and package metadata unchanged. I checked the PR head JSON against the OSV schema, confirmed commit e8fc7edb238f1022e39f9d0b9d297fc7c21fb0a5 resolves to the simple_httpclient cross-origin redirect auth-header fix, confirmed the v6.5.6 URL resolves, and confirmed PyPI has tornado==6.5.6.