Change CVE-2016-2338 URL to NVD

Updated the CVE URL to point to NVD instead of GitHub.

Author: jasnow

rubies/ruby/CVE-2016-2338.yml

@@ -2,7 +2,7 @@
 engine: ruby
 cve: 2016-2338
 ghsa: r46x-xjwr-8v2g
-url: https://github.com/advisories/GHSA-r46x-xjwr-8v2g
+url: https://nvd.nist.gov/vuln/detail/CVE-2016-2338
 title: Exploitable heap overflow vulnerability exists
   in Ruby's Psych::Emitter start_document function
 date: 2022-09-28