PHP 8 support

[luceos]

fixes #2439

Attempts to offer support for php 8, so far:

• dropped 7.2 due to laminas let's try to add both versions.
• dropped franz/whoops-middleware, needs a new version compatible with the diactoros lib
• replaced fig cookies with hansott/psr7-cookies

[franzliedke]

franzl/whoops-middleware now supports everything from PHP 7.2 through PHP 8.0 with the new 2.0 release. Please use that. 😃

[luceos]

@franzliedke thank you, I was hoping for that 🤗

[tankerkiller125]

Looks like the main showstopper was the cookie library originally, this looks good I see no issues with the cookie lib replacement and CI test are passing. (I have no tested locally yet)

[askvortsov1]

Looks like our current library was updated: https://packagist.org/packages/dflydev/fig-cookies

In the spirit of minimal changes, I'd say we should stick with that, although keep the new tests (and include a test case for calling ->expires())

Sorry for all the back and forth on this one