Add i18next-fs-backend fixed release references

[cookesan]

Adds i18next-fs-backend fixed release references to GHSA-2933-q333-qg83.

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-2933-q333-qg83/GHSA-2933-q333-qg83.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]

Maintainer audit: this only expands the reference set for the i18next-fs-backend advisory. Commit 3ab0448087da6935a40117f904b7457281f963f4 resolves, release tag v2.6.6 resolves, npm version i18next-fs-backend 2.6.6 resolves, and CVE-2026-48713 is present in NVD. The advisory JSON parses, the committed diff passes git diff --check, the PR is merge-clean, and advisory processing is successful. No package, affected range, severity, or database metadata is changed.