Add Langflow upload advisory references

[cookesan]

Adds Langflow upload advisory references to GHSA-qwqc-p3q8-wcg9.

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-qwqc-p3q8-wcg9/GHSA-qwqc-p3q8-wcg9.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-qwqc-p3q8-wcg9 and CVE-2026-55446 remain public and consistent with this advisory.
• Verified langflow-ai/langflow PR [GHSA-ggwr-4vr8-g7wv] Apache Airflow Path Traversal vulnerability #3923, commit f873309004ca10b58bca623a163928c1678bc78d, release v1.0.19, and PyPI langflow 1.0.19.
• Added the NVD advisory reference and nvd_published_at value after confirming the public NVD record.
• Local validation passed: jq empty and git diff --check.

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