Add Support for PHP 8.5

[gsteel]

• Upgrading Psalm to v6 first is required Update dependency vimeo/psalm to v6 #61
• In order to upgrade Psalm to v6, we'll likely need to get rid of Mockery Update dependency psalm/plugin-mockery to v1 #36
• It's probably a good idea to get router v4 support added, but not necessary Update dependency mezzio/mezzio-router to v4 #64
• Set symfony/process to latest version in composer.json

[tyrsson]

Probably need to bump laminas/laminas-stratigility to ^4.x

I ran into this issue while trying setup a custom build (without starting with the skeleton) so that I can use the latest view components. Mezzio tooling will not install due to the outdated version of stratigility.

I have not checked to see if it's possible to downgrade stratigility with the new versions of the view components.