Strict and native Types + PHP8.0 Drop + PHPUnit Upgrade [BC Break]

[marcelthole]

Q	A
BC Break	yes

Description

As mentioned in https://github.com/laminas/laminas-crypt/pull/34#issuecomment-2228283417 we could use the chance and add strict types and native types for the next release if we have already BC Breaks.

So here some (mostly automated) changes:

• use `declare(strict_types=1);
• Drop mcrypt support (was only for PHP 7)
• Drop PHP 8.0 support
• Upgrade PHPUnit to Version 10 and laminas-coding-standard to 2.5
• Use native typehints for every method and property

What is missing?

• use more strict array annotations, but these would not be a BC Break in the future
• Maybe also introduce psalm? But that's more like an feature so i didn't added it here

[Ocramius]

Note: we need to open 4.0.x before going for a merge here

[Xerkus]

This component was voted to be abandoned but we failed to follow up and mark it as such. https://github.com/laminas/technical-steering-committee/blob/main/meetings/minutes/2023-11-06-TSC-Minutes.md#decisions