minor #18479 Remove deprecated directive (OskarStark)

This PR was merged into the 7.0 branch.

Discussion
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Remove deprecated directive

Follows
* #18475

Commits
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e46a7a0 Remove deprecated directive

Author: OskarStark

reference/forms/types/options/model_timezone.rst.inc

@@ -6,10 +6,4 @@
 Timezone that the input data is stored in. This must be one of the
 `PHP supported timezones`_.
 
-.. deprecated:: 6.4
-
-    Starting from Symfony 6.4, it's deprecated to pass ``DateTime`` or ``DateTimeImmutable``
-    values to this form field with a different timezone than the one configured with
-    the ``model_timezone`` option.
-
 .. _`PHP supported timezones`: https://www.php.net/manual/en/timezones.php