Set PHP min requirement to 8.2 and Prepare 1.0 Version

[alexander-schranz]

For easier maintainance.

[Copilot]

Pull request overview

Updates the package’s supported PHP/tooling baseline to PHP 8.2+ in preparation for a 1.0 release, and aligns CI accordingly.

Changes:

• Raised the Composer PHP requirement to >= 8.2 (and updated PHPUnit constraints accordingly).
• Simplified the GitHub Actions test matrix by dropping PHP 8.0/8.1 jobs and updating test execution steps.
• Removed a PHPStan suppression in the test application kernel.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
tests/Application/Kernel.php	Removes a PHPStan suppression around bundle env lookup.
composer.json	Updates PHP and PHPUnit version constraints.
.github/workflows/test-application.yaml	Updates CI PHP matrix, dependency strategy, and action versions/steps.

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