The basic system requirements for Shopware 6 can be found here.
For 6.5 the following versions are required:
PHP 8.1 oder höher
node-js Version 18
To be able to update to Shopware 6.5, it is necessary to deactivate all extensions. Note also to set the theme to default and deactivate it under extensions.
Only with the extensions deactivated is the update to 6.5 possible.
Once on 6.5, the extensions can be updated and then reactivated.
Perform the update as described here in the administration.
