www/node18: Update to 18.20.4

Changes: https://github.com/nodejs/node/releases

		https://github.com/nodejs/node/blob/main/doc/changelogs/CHANGELOG_V18.md

Security: CVE-2024-22020, CVE-2024-36138
(cherry picked from commit 92c8de6e362630e47dd5aa19a1de87da2b87fe58)