Disable the PsySH version check

[pfrenssen]

I had noticed that launching drush php is often inexplicably slow, taking up to 30 seconds to launch. I've now discovered that this happens when I am on a slow mobile connection. PsySH has a feature to check for updates, and by default this checks once per week. Unfortunately since we are using a "bundled" version and generate the configuration on the fly when launching it this performs the update check every single time it is launched.

I can understand the usefulness of this feature when using PsySH standalone, but I think this version check is pretty pointless in our typical use case. PsySH is a dependency of Drush which is a dev dependency of Drupal which is a dependency of a custom web project which will typically only be updated whenever a security update is available. I don't think most maintainers of Drupal sites are going to jump at the opportunity to update their production instances just because this niche developer tool has a new update 😛

I had a look to port this to the master branch too but it was not immediately clear to me where the PsySH configuration was being generated.

[damiankloip]

Yes, I was thinking about disabling this anyways.. It doesn't make much sense when most people will be using x version of drush, so the psysh version will be locked anyway.

Thanks @pfrenssen!