minor #18572 [Serializer] Deprecate CacheableSupportsMethodInterface (alexandre-daubois)

This PR was merged into the 6.3 branch.

Discussion
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[Serializer] Deprecate `CacheableSupportsMethodInterface`

Part of #18471

Commits
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c190a8d [Serializer] Deprecate `CacheableSupportsMethodInterface`

Author: javiereguiluz

serializer/custom_normalizer.rst

@@ -82,6 +82,12 @@ is called.
     All built-in :ref:`normalizers and denormalizers <component-serializer-normalizers>`
     as well the ones included in `API Platform`_ natively implement this interface.
 
+.. deprecated:: 6.3
+
+    The :class:`Symfony\\Component\\Serializer\\Normalizer\\CacheableSupportsMethodInterface`
+    interface is deprecated since Symfony 6.3. You should implement the
+    ``getSupportedTypes()`` method instead, as shown in the section below.
+
 Improving Performance of Normalizers/Denormalizers
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~