Add PhpSpreadsheet advisory references

[cookesan]

Adds PhpSpreadsheet advisory references to GHSA-87m4-826x-3crx.

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-87m4-826x-3crx/GHSA-87m4-826x-3crx.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]

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

• The patch only adds the PhpSpreadsheet 1.30.5 release reference and fix commit reference; it does not change affected ranges, package metadata, or severity.
• The release tag resolves as 1.30.5, and the commit resolves to 1433b34843af9f572cb4ad6b3ff92efce32e6c71.
• The commit subject is Security Patch.

No other advisory fields are changed.