Add Gitea public-token fix reference

[cookesan]

Adds Gitea public-token fix reference to GHSA-xfq3-qj7j-4565.

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/2025/12/GHSA-xfq3-qj7j-4565/GHSA-xfq3-qj7j-4565.json), JSON parses, git diff --check passes, and the exact-head worktree is clean.
• Revalidated the added public references in the diff; all resolve through their source site or registry.

[cookesan]

Refreshed on July 8, 2026:

• GHSA-xfq3-qj7j-4565 and CVE-2025-68941 remain public and consistent with this advisory.
• Verified go-gitea/gitea PR #32218, commit 56051d9b3bd58284a1b50c3d974fab3bd0acacaa, release v1.22.3, and the Go module proxy record for code.gitea.io/gitea v1.22.3.
• Local validation passed: jq empty and git diff --check.

No affected range, package, or severity changes are included.