Add pdfmake SSRF fix commit reference

[cookesan]

Adds pdfmake SSRF fix commit reference to GHSA-wp52-r2fp-4vmr.

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/2026/03/GHSA-wp52-r2fp-4vmr/GHSA-wp52-r2fp-4vmr.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]

Rechecked this reference-only PR while keeping the open Advisory Database queue current.

• The patch only adds the pdfmake SSRF fix commit reference; it does not change affected ranges, package metadata, or severity.
• The commit resolves to d20ac0b4c1e73c8b542160fbced0647ac7affc17.
• The commit subject matches the URL access control context: new method setUrlAccessPolicy() (#2920).

No other advisory fields are changed.