Update dependency phpunit/phpunit to v8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
phpunit/phpunit	require-dev	major	6.0 -> 8.1.2	homepage, source

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Release Notes

sebastianbergmann/phpunit

v8.1.2

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v8.1.1

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v8.1.0

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v8.0.6

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v8.0.5

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v8.0.4

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v8.0.3

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v8.0.0

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v7.5.8

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v6.5.14

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⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻️ Renovate will retry this branch, including artifacts, only when one of the following happens:

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The artifact failure details are included below:

File name: composer.lock

Command failed: docker run --rm -v /mnt/renovate/gh/poetapp/wordpress-plugin:/mnt/renovate/gh/poetapp/wordpress-plugin -v /mnt/renovate/tmp/renovate/cache/composer:/mnt/renovate/tmp/renovate/cache/composer -e COMPOSER_CACHE_DIR -w /mnt/renovate/gh/poetapp/wordpress-plugin renovate/composer composer update phpunit/phpunit --ignore-platform-reqs --no-ansi --no-interaction --no-scripts --no-autoloader
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for phpunit/phpunit 8.1.2 -> satisfiable by phpunit/phpunit[8.1.2].
    - Conclusion: don't install doctrine/instantiator 1.0.5
    - phpunit/phpunit 8.1.2 requires doctrine/instantiator ^1.1 -> satisfiable by doctrine/instantiator[1.1.0, 1.2.0, 1.2.x-dev].
    - Can only install one of: doctrine/instantiator[1.1.0, 1.0.5].
    - Can only install one of: doctrine/instantiator[1.2.0, 1.0.5].
    - Can only install one of: doctrine/instantiator[1.2.x-dev, 1.0.5].
    - Installation request for doctrine/instantiator (locked at 1.0.5) -> satisfiable by doctrine/instantiator[1.0.5].

 `docker run --rm -v /mnt/renovate/gh/poetapp/wordpress-plugin:/mnt/renovate/gh/poetapp/wordpress-plugin -v /mnt/renovate/tmp/renovate/cache/composer:/mnt/renovate/tmp/renovate/cache/composer -e COMPOSER_CACHE_DIR -w /mnt/renovate/gh/poetapp/wordpress-plugin renovate/composer composer update phpunit/phpunit --ignore-platform-reqs --no-ansi --no-interaction --no-scripts --no-autoloader` (exited with error code 2)