Add Gitea release deletion fix references

[cookesan]

Adds Gitea release deletion fix references to GHSA-cm54-pfmc-xrwx.

Audit refresh, July 8, 2026:

• Confirmed the live PR is open, approved without requested changes, 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-cm54-pfmc-xrwx/GHSA-cm54-pfmc-xrwx.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-cm54-pfmc-xrwx and CVE-2025-68938 remain public and consistent with this advisory.
• Verified go-gitea/gitea PRs #36002 and #36004, commit 20cf4b78493ad4bff572e1b1772ad57d82c43b60, release v1.25.2, and the Go module proxy record for code.gitea.io/gitea v1.25.2.
• Local validation passed: jq empty and git diff --check.

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