T16543 volt upper

[niden]

Hello!

• Type: bug fix
• Link to issue: #16543

In raising this pull request, I confirm the following:

• [x] I have read and understood the Contributing Guidelines
• [x] I have checked that another pull request for this purpose does not exist
• [x] I wrote some tests for this PR
• [x] I have updated the relevant CHANGELOG
• [ ] I have created a PR for the documentation about this change

Changed Phalcon\Mvc\View\Engine\Volt\Compiler::filter to use the helper with upper and lower for UTF-8 characters Changed Phalcon\Di\AbstractInjectionAware to extend stdClass for PHP 8.2 deprecation warnings

Thanks