Allow drupal/filehash:^3

[kayakr]

Filehash 3.0.1 is out https://www.drupal.org/project/filehash/releases/3.0.1

Islandora is hard-coded in composer.json to only support filehash:^2 https://github.com/Islandora/islandora/blob/2.x/composer.json#L21

I suggest supporting both, e.g. filehash: ^2 || ^3

[rosiel]

I was bitten by not testing the previous major update of filehash properly.

So I just want to outline what needs to be tested:

When we update a file (/media), islandora code tests whether the filehash has changed, and does not run derivatives if it's got the same sha1.

The code: https://github.com/Islandora/islandora/blob/2.11.0/islandora.module#L185-L188

[jordandukart]

Closing as this merged in #1016.