Add array return to all hook_requirements implementations

@mstrelan

MR looks good moving to RTBC.

Thank You!!

This too needs a rebase

Rebased this and resolved conflicts. However, after running the command:
grep "_requirements\\\\.* has no return type specified" core/.phpstan-baseline.php

I noticed that two additional entries are still listed:

'message' => '#^Function install_check_requirements\\(\\) has no return type specified\\.$#',
'message' => '#^Function update_check_requirements\\(\\) has no return type specified\\.$#',

I’m unsure if we also need to update these?

No, those are not hooks, they cannot be updated here.

Thank you for the confirmation. Since everything is addressed, I am moving this to Needs Review.

Is it really worth doing this when we are in the middle of changing all hook_requirements() implementations anyway?

Sure why not, we did it for all of the other hooks, at the minimum it means you don't have to manage phpstan when converting them which is nice.

Applied the diff and regenerated the baseline. That results in finding 2 instances but they are not hooks.

(11.x)$ grep "_requirements\\\\.* has no return type specified" core/.phpstan-baseline.php
        'message' => '#^Function install_check_requirements\\(\\) has no return type specified\\.$#',
        'message' => '#^Function update_check_requirements\\(\\) has no return type specified\\.$#',

Committed a0503e2 and pushed to 11.x. Thanks!