minor #26285 [FrameworkBundle] fix lowest supported Serializer version (xabbuh)

This PR was merged into the 4.1-dev branch.

Discussion
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[FrameworkBundle] fix lowest supported Serializer version

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        |

The `AbstractObjectNormalizer::setMaxDepthHandler()` method does not
exist before `symfony/serializer` 4.1.

Commits
-------

3b092a08ea fix lowest supported Serializer version

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -67,7 +67,7 @@
         "symfony/console": "<3.4",
         "symfony/form": "<3.4",
         "symfony/property-info": "<3.4",
-        "symfony/serializer": "<3.4",
+        "symfony/serializer": "<4.1",
         "symfony/stopwatch": "<3.4",
         "symfony/translation": "<3.4",
         "symfony/validator": "<4.1",

src/Symfony/Component/Serializer/Normalizer/AbstractObjectNormalizer.php

@@ -214,7 +214,7 @@ abstract class AbstractObjectNormalizer extends AbstractNormalizer
     abstract protected function getAttributeValue($object, $attribute, $format = null, array $context = array());
 
     /**
-     * Sets an handler function that will be called when the max depth is reached.
+     * Sets a handler function that will be called when the max depth is reached.
      */
     public function setMaxDepthHandler(?callable $handler): void
     {