style: use @PHP84Migration ruleset (#2398)

## Description

use `@PHP84Migration` ruleset

## What type of PR is this? (check all applicable)
- [ ] Bug Fix
- [ ] Feature
- [ ] Refactor
- [ ] Deprecation
- [ ] Breaking Change
- [ ] Documentation Update
- [ ] CI

## Checklist
- [ ] I have made corresponding changes to the documentation (`docs/`)
- [ ] I have made corresponding changes to the changelog
(`CHANGELOG.md`)

tests/Command/DumpCommandTest.php

@@ -49,10 +49,10 @@ public function testYaml(): void
             '--server-url' => 'http://example.com/api',
         ]);
         $expectedYaml = <<<YAML
-servers:
-  -
-    url: 'http://example.com/api'
-YAML;
+            servers:
+              -
+                url: 'http://example.com/api'
+            YAML;
         self::assertStringContainsString($expectedYaml, $output);
     }
 

tests/Model/ModelRegistryTest.php

@@ -47,7 +47,8 @@ public function testNameCollisionsAreLogged(Type $type, array $arrayType): void
             ->expects(self::once())
             ->method('info')
             ->with(
-                'Can not assign a name for the model, the name "ModelRegistryTest" has already been taken.', [
+                'Can not assign a name for the model, the name "ModelRegistryTest" has already been taken.',
+                [
                     'model' => [
                         'type' => $arrayType,
                         'options' => [],
@@ -65,7 +66,8 @@ public function testNameCollisionsAreLogged(Type $type, array $arrayType): void
                             'extra_context' => true,
                         ],
                     ],
-                ]);
+                ]
+            );
 
         $registry = new ModelRegistry([], $this->createOpenApi(), []);
         $registry->setLogger($logger);
@@ -124,7 +126,8 @@ public function testNameCollisionsAreLoggedWithAlternativeNames(): void
             ->expects(self::once())
             ->method('info')
             ->with(
-                'Can not assign a name for the model, the name "ModelRegistryTest" has already been taken.', [
+                'Can not assign a name for the model, the name "ModelRegistryTest" has already been taken.',
+                [
                     'model' => [
                         'type' => [
                             'class' => 'Nelmio\\ApiDocBundle\\Tests\\Model\\ModelRegistryTest',
@@ -151,7 +154,8 @@ public function testNameCollisionsAreLoggedWithAlternativeNames(): void
                         'groups' => ['group1'],
                         'serialization_context' => ['groups' => ['group1']],
                     ],
-                ]);
+                ]
+            );
 
         $registry = new ModelRegistry([], $this->createOpenApi(), $alternativeNames);
         $registry->setLogger($logger);