[Bundles] Mention the tool to convert XML files to PHP

Author: javiereguiluz

setup/bundles.rst

@@ -86,6 +86,12 @@ given version, check for that feature rather than the kernel version::
         // code for the new OptionsResolver API
     }
 
+.. deprecated:: 7.4
+
+    Symfony 7.4 deprecated the XML configuration format, which was the recommended
+    format for bundles in previous versions. Consider using the `gromnan/symfony-config-xml-to-php`_
+    tool to automatically convert XML configuration files to PHP.
+
 Testing your Bundle in Symfony Applications
 -------------------------------------------
 
@@ -156,3 +162,4 @@ as a starting point for your own GitHub CI configuration:
 
 .. _`Symfony releases plan`: https://symfony.com/releases
 .. _`Composer path repository option`: https://getcomposer.org/doc/05-repositories.md#path
+.. _`gromnan/symfony-config-xml-to-php`: https://github.com/GromNaN/symfony-config-xml-to-php