Do not check php-geos requirement in the update phase

[paul121]

Right now you cannot run update.php if the php-geos extension is not installed. This shouldn't be a blocker to running updates. I don't have php-geos at the moment in my local ddev development environment.

At first I was going to check if $phase != 'runtime' so that this requirement is only run at runtime, but I think it is good to include this during the install phase so that a warning message is displayed.

It seems like a core issue that REQUIREMENT_WARNING shouldn't block update.php but alas... the same issue here: https://www.drupal.org/project/email_noreply/issues/2184049

hook_requirements doc page for reference:
https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Extension%21module.api.php/function/hook_requirements/10.0.x

/update.php output:

[mstenta]

Good catch @paul121 - thanks! Merged.