www/node18: Update to 18.20.2

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

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

Security: CVE-2024-27980, CVE-2024-27982, CVE-2024-27983
(cherry picked from commit da3b481f74b62e5395d17ea6e77145e387d74b26)