chore: upgrade phpunit to 12.5

tests/Model/DestinationDtoTest.php

@@ -27,9 +27,7 @@ class DestinationDtoTest extends TestCase
         $this->assertSame(['at', 'ch', 'fr', 'it', 'de', 'nl'], DestinationDto::countryCodes());
     }
 
-    /**
-     * @dataProvider isoCountryCodes
-     */
+    #[\PHPUnit\Framework\Attributes\DataProvider('isoCountryCodes')]
     public function testAnIsoCountryCodeIsAccepted(string $code): void
     {
         $this->assertCount(0, $this->validateCountry($code));
@@ -37,9 +35,8 @@ class DestinationDtoTest extends TestCase
 
     /**
      * The four that the form offered and the constraint refused.
-     *
-     * @dataProvider busProNetCountryAbbreviations
      */
+    #[\PHPUnit\Framework\Attributes\DataProvider('busProNetCountryAbbreviations')]
     public function testABusProNetAbbreviationIsNoLongerAccepted(string $abbreviation): void
     {
         $this->assertCount(1, $this->validateCountry($abbreviation));