[Sync EN] Add PHP 8.4.0 changelog entries for Session and LDAP pages (#5366)

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Commit: https://github.com/php/doc-en/commit/ca23605a1c0e46b9ec85975c6387528c32a7087f
PR: https://github.com/php/doc-en/pull/5366

Zu aktualisierende DE-Dateien

• reference/ldap/functions/ldap-connect.xml
• reference/session/functions/session-set-save-handler.xml