[TASK] Update phpstan/phpstan-symfony to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
phpstan/phpstan-symfony	^1.2 -> ^2.0

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Release Notes

phpstan/phpstan-symfony (phpstan/phpstan-symfony)

v2.0.0

Compare Source

• 1ef4dce - Merge remote-tracking branch 'origin/1.4.x' into 2.0.x
• 55ff7b7 - Merge remote-tracking branch 'origin/1.4.x' into 2.0.x
• 282a698 - Fix after PHPStan update
• bb3e671 - Cleanup skipCheckGenericClasses
• 237165e - Fixes after PHPStan update
• d1e08ac - Fixes after PHPStan update
• a0572ad - Fixes after PHPStan update
• 7e5633f - [BCB] Remove legacy config options with _ in their name
• 4f260f0 - Merge remote-tracking branch 'origin/1.4.x' into 2.0.x
• 3eb61a0 - Fixes after PHPStan update
• bd9efb7 - Fixes after PHPStan update
• 23a776d - Fixes after TypeSpecifier BC break
• c88f96e - Drop dependency on nikic/php-parser
• 90e8976 - Update build-cs
• 2f736a6 - Stop testing PHP 7.2 and 7.3
• 2c53b38 - Open 2.0.x

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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.

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

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[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: Tests/CGL/composer.lock

Command failed: composer update phpstan/phpstan-symfony:2.0.2 --with-dependencies --ignore-platform-req ext-intl --no-ansi --no-interaction --no-scripts --no-autoloader --no-plugins
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires phpstan/phpstan-symfony ^2.0 -> satisfiable by phpstan/phpstan-symfony[2.0.2].
    - phpstan/phpstan-symfony 2.0.2 requires phpstan/phpstan ^2.1.2 -> found phpstan/phpstan[2.1.2] but these were not loaded, likely because it conflicts with another require.

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