minor symfony#21064 [OptionsResolver] Remove setDefault() method to set nested options (javiereguiluz)

This PR was merged into the 8.0 branch.

Discussion
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[OptionsResolver] Remove setDefault() method to set nested options

Fixes symfony#21058.

Yonel did a great update in symfony#21058 to make all code examples use the new method. So, we can just remove the `deprecated` directive and that's it.

Commits
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e914251 [OptionsResolver] Remove setDefault() method to set nested options

Author: javiereguiluz

components/options_resolver.rst

@@ -686,12 +686,6 @@ default value::
         ],
     ]);
 
-.. deprecated:: 7.3
-
-    Defining nested options via :method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::setDefault`
-    is deprecated since Symfony 7.3. Use the :method:`Symfony\\Component\\OptionsResolver\\OptionsResolver::setOptions`
-    method instead, which also allows defining default values for prototyped options.
-
 .. versionadded:: 7.3
 
     The ``setOptions()`` method was introduced in Symfony 7.3.