chore: update PHPStan and Symfony dev dependencies

[huangdijia]

Summary

• Add support for PHPStan 2.0 alongside existing 1.0 support
• Add support for Symfony 7.0 components alongside existing 6.4 support

Changes

This PR updates the development dependencies to support newer versions:

PHPStan

• Updated constraint from ^1.0 to ^1.0 || ^2.0

Symfony Components

• symfony/http-client: ^6.4 → ^6.4 || ^7.0
• symfony/mailgun-mailer: ^6.4 → ^6.4 || ^7.0
• symfony/notifier: ^6.4 → ^6.4 || ^7.0
• symfony/postmark-mailer: ^6.4 → ^6.4 || ^7.0

Benefits

• Ensures compatibility with the latest stable versions of development tools
• Maintains backward compatibility with existing versions
• Allows developers to use newer features and improvements from PHPStan 2.0 and Symfony 7.0

Test plan

• Verify composer update runs successfully
• Run PHPStan analysis to ensure no compatibility issues
• Run existing test suite to verify no regressions

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/update-dev-dependencies

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