Improved running server detection using `lsof` for multiple processes…

… listing the same port.

Added more steps and Gherkin lint.

Updated PHPStan and Rector.

Fixed PHP version compatibility.

Use mink-browserkit-driver instead of mink-goutte-driver EOL. (#14)

Update cimg/php Docker tag to v8.3.0

Create FUNDING.yml

Updated namespace to DrevOps.

Updated behat to stable version.