Update https-proxy-agent advisory references

[cookesan]

Updates https-proxy-agent advisory references in GHSA-8g7p-74h8-hg48.

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/2018/07/GHSA-8g7p-74h8-hg48/GHSA-8g7p-74h8-hg48.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 PR while keeping the open Advisory Database queue current.

• The patch adds the https-proxy-agent fixed release reference for 2.2.0.
• It also corrects the rejected duplicate NVD reference from CVE-2018-3736 to the active advisory alias CVE-2018-3739.
• The fixed version in the advisory remains 2.2.0.

No affected ranges, package names, or severity fields are changed.