Update wordpress Docker tag to v6.8.0

This MR contains the following updates:

Package	Type	Update	Change
wordpress	final	minor	6.4.2-apache -> 6.8.0-apache

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testserver/docker_wordpress/templates/Dockerfile

-FROM wordpress:6.4.2-apache
+FROM wordpress:6.7.0-apache
 
 # install the PHP extensions we need
 RUN set -x \