bug #777 PHP 8.2 Compatibility DateTime::getLastErrors (PhilETaylor)

This PR was squashed before being merged into the 6.1.x-dev branch.

Discussion
----------

PHP 8.2 Compatibility DateTime::getLastErrors

DateTime::getLastErrors() is documented as returning `array|false` https://www.php.net/manual/en/datetime.getlasterrors.php

As discussed here symfony/symfony#47428 (comment)

`@derickr` quoted as saying
"This is a bug fix as the new 8.2 behaviour is how it has been documented for over a decade."

Commits
-------

00f08ea PHP 8.2 Compatibility DateTime::getLastErrors

src/Request/ParamConverter/DateTimeParamConverter.php

@@ -49,7 +49,9 @@ public function apply(Request $request, ParamConverter $configuration)
         if (isset($options['format'])) {
             $date = $class::createFromFormat($options['format'], $value);
 
-            if (0 < \DateTime::getLastErrors()['warning_count']) {
+            $errors = \DateTime::getLastErrors() ?: ['warning_count' => 0];
+
+            if (0 < $errors['warning_count']) {
                 $date = false;
             }