Add Gitea stopwatch fix reference

[cookesan]

Adds Gitea stopwatch fix reference to GHSA-j8xr-c56q-m8jj.

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-j8xr-c56q-m8jj/GHSA-j8xr-c56q-m8jj.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-j8xr-c56q-m8jj and CVE-2026-20883 remain public and consistent with this advisory.
• Verified go-gitea/gitea PRs #36340 and #36368, commits 95ea2df00a70176c516b12f3cfee8c84a310280f and 812a3cffb3dde6a07d5191b78b1f1ed9ea36ef34, 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.