Add n8n fixed source tag and package references

[cookesan]

Adds n8n fixed source tag and package references to GHSA-2vff-hj5x-8gq7.

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-2vff-hj5x-8gq7/GHSA-2vff-hj5x-8gq7.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-2vff-hj5x-8gq7 with n8n 2.25.7 and 2.26.2 source tags and npm package evidence. I checked the PR head JSON against the OSV schema, confirmed both source tag URLs resolve, and confirmed npm has n8n@2.25.7 and n8n@2.26.2; the affected npm ranges, CVSS scores, alias, and package metadata stay unchanged.