Fixed the GHSA URL for CVE-2017-17790.

Author: postmodern

rubies/ruby/CVE-2017-17790.yml

@@ -32,4 +32,4 @@ related:
    - https://lists.debian.org/debian-lts-announce/2017/12/msg00025.html
    - https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
    - https://www.debian.org/security/2018/dsa-4259
-   - https://github.com/advisories/GHSA-qf67-vmxx-gp4jGHSA-47cm-jxff-w8wg.json
+   - https://github.com/advisories/GHSA-47cm-jxff-w8wg