Build/Test Tools: Remove version from docker-compose.yml.

The `version` property throws a warning when working with the local Docker environment. According to the Docker Compose spec, the property only remains for backward compatibility and should be removed.

Props narenin, mukesh27, swissspidy.
Fixes #61101.
Built from https://develop.svn.wordpress.org/trunk@58157


git-svn-id: https://core.svn.wordpress.org/trunk@57620 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58156';
+$wp_version = '6.6-alpha-58157';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.