[TASK] Update phpunit/phpcov to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpunit/phpcov	^10.0 || ^11.0.0 → ^12.0.0

---

Release Notes

sebastianbergmann/phpcov (phpunit/phpcov)

v12.0.0

Compare Source

Added

• Added support for PHPUnit 13

Removed

• PHPUnit 12 is no longer supported
• PHP 8.3 is no longer supported

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

⚠️ 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:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: composer.lock

Command failed: composer update phpunit/phpcov:12.0.0 --with-dependencies --ignore-platform-req=ext-* --ignore-platform-req=lib-* --no-ansi --no-interaction --no-scripts --no-autoloader --no-plugins --minimal-changes
Loading composer repositories with package information
Dependency phpunit/phpunit is also a root requirement. Package has not been listed as an update argument, so keeping locked at old version. Use --with-all-dependencies (-W) to include root dependencies.
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires phpunit/phpcov ^12.0.0 -> satisfiable by phpunit/phpcov[12.0.0].
    - phpunit/phpcov 12.0.0 requires phpunit/phpunit ^13.0.0 -> found phpunit/phpunit[13.0.0, 13.0.1, 13.0.2, 13.0.3] but it conflicts with your root composer.json require (^11.5 || ^12.1).

Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.