package/nodejs: security bump version to 8.11.4

Release notes:
https://nodejs.org/en/blog/vulnerability/august-2018-security-releases/



Fixes CVE-2018-12115, also CVEs were fixed in included OpenSSL code
which do not use for the target build.

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>