Add Gitea notification fix references

[cookesan]

Adds Gitea notification fix references to GHSA-2vgv-hgv4-22mh.

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/2026/01/GHSA-2vgv-hgv4-22mh/GHSA-2vgv-hgv4-22mh.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-2vgv-hgv4-22mh and CVE-2026-20800 remain public and consistent with this advisory.
• Verified go-gitea/gitea PRs #36339 and #36387, commits 67e75f30a83d2523cedc37ad7b03bcba66947833 and 175a42582521b89e8b19ae2d515e1e8a3a5616a6, release v1.25.4, and the Go module proxy record for github.com/go-gitea/gitea v1.25.4.
• Local validation passed: jq empty and git diff --check.

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