fix parsing calls of methods named "method"

src/Symfony/Component/DependencyInjection/Loader/YamlFileLoader.php

@@ -471,7 +471,7 @@ class YamlFileLoader extends FileLoader
                     throw new InvalidArgumentException(sprintf('Invalid method call for service "%s", did you forgot a leading dash before "%s: ..." in "%s"?', $id, $k, $file));
                 }
 
-                if (isset($call['method'])) {
+                if (isset($call['method']) && \is_string($call['method'])) {
                     $method = $call['method'];
                     $args = $call['arguments'] ?? [];
                     $returnsClone = $call['returns_clone'] ?? false;

src/Symfony/Component/DependencyInjection/Tests/Fixtures/yaml/alt_call.yaml

@@ -3,3 +3,5 @@ services:
         calls:
             - foo: [1, 2, 3]
             - bar: !returns_clone [1, 2, 3]
+            - method:
+                  - url

src/Symfony/Component/DependencyInjection/Tests/Loader/YamlFileLoaderTest.php

@@ -968,6 +968,7 @@ class YamlFileLoaderTest extends TestCase
         $expected = [
             ['foo', [1, 2, 3]],
             ['bar', [1, 2, 3], true],
+            ['method', ['url']],
         ];
 
         $this->assertSame($expected, $container->getDefinition('foo')->getMethodCalls());