Bump tested up to and requires at least in main plugin file too.

aaronfc · aaronfc · commit d7416988095e · 2022-05-16T14:14:35.000+02:00
diff --git a/syntaxhighlighter.php b/syntaxhighlighter.php
@@ -11,8 +11,8 @@
 Text Domain:  syntaxhighlighter
 License:      GPL2
 License URI:  https://www.gnu.org/licenses/gpl-2.0.html
-Requires at least: 5.6
-Tested up to: 5.8
+Requires at least: 5.7
+Tested up to: 5.9
 Requires PHP: 7.0
 
 **************************************************************************/
