Update the link to the symmetry magazine one

Author: nhanvtran

_posts/2021-07-13-symmetry-magazine.md

@@ -1,6 +1,6 @@
 ---
 title: Symmetry Magazine
-external_link: https://cerncourier.com/a/hunting-anomalies-with-an-ai-trigger/
+external_link: https://www.symmetrymagazine.org/article/blink-and-its-gone
 layout: post
 description: "Symmetry Magazine article about fast AI trigger systems in particle physics titled \"Blink and it's gone\""
 image: /images/Inline_Blink_and_its_gone.jpg