[Sync EN] ext/session: Add PHP 8.4 deprecation notices for session directives (#5702)

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Commit: https://github.com/php/doc-en/commit/7fabff299de8a894888e8064797ed3278f50b356
PR: https://github.com/php/doc-en/pull/5702

Zu aktualisierende DE-Dateien

• reference/session/ini.xml