Update minimum_wp_version and testVersion in phpcs.xml.dist.sample

This commit updates the example `phpcs.xml.dist.sample` file to reflect that WP 6.6 is now the minimum supported version (three versions behind the latest release). It also updates the `testVersion` property from `7.0-` to `7.2-` since WP 6.6 dropped support for PHP 7.0 and 7.1 (https://make.wordpress.org/core/2024/04/08/dropping-support-for-php-7-1/).

Author: rodrigoprimo

phpcs.xml.dist.sample

@@ -78,7 +78,7 @@
 	https://github.com/PHPCompatibility/PHPCompatibility
 	-->
 	<!--
-	<config name="testVersion" value="7.0-"/>
+	<config name="testVersion" value="7.2-"/>
 	<rule ref="PHPCompatibilityWP">
 		<include-pattern>*\.php</include-pattern>
 	</rule>
@@ -100,7 +100,7 @@
 	the wiki:
 	https://github.com/WordPress/WordPress-Coding-Standards/wiki/Customizable-sniff-properties
 	-->
-	<config name="minimum_wp_version" value="6.5"/>
+	<config name="minimum_wp_version" value="6.6"/>
 
 	<rule ref="WordPress.WP.I18n">
 		<properties>