Bump tested up to header to indicate WordPress 6.9 support.

Author: peterwilsoncc

readme.txt

@@ -3,7 +3,7 @@ Contributors:      10up, adamsilverstein, johnwatkins0, jeffpaul
 Tags:              Special Characters, Character Map, Omega, character inserter, symbols
 Stable tag:        1.1.3
 Requires at least: 6.6
-Tested up to:      6.8
+Tested up to:      6.9
 Requires PHP:      7.4
 License:           GPLv2
 License URI:       https://www.gnu.org/licenses/old-licenses/gpl-2.0.html