Cannot request events delta without startDateTime

Describe the bug

Event delta documentation says param startDateTime is optional when working with calendars but class DeltaRequestBuilder always include it in template url causing call to fail with ODataError.

Expected behavior

When performing a normal call without any optional param to get a full delta, no error should append.

How to reproduce

$client->me()
->calendars()
->byCalendarId($remoteId)
->events()
->delta()
->get(
    new DeltaRequestBuilderGetRequestConfiguration([
        'Prefer' => sprintf('outlook.timezone="%s"', $local->getTimeZone()->getName())
    ])
)
->wait()

SDK Version

2.8.0

Latest version known to work for scenario above?

No response

Known Workarounds

No response

Debug output

{
    "error": {
        "code": "ErrorInvalidParameter",
        "message": "The value '' of parameter 'StartDateTime' is invalid."
    }
}

Configuration

No response

Other information

No response

src/Generated/Users/Item/Calendars/Item/Events/Delta/DeltaRequestBuilder.php から始め、そこにある template URL と issue にリンクされている Event delta のドキュメントを比較します。startDateTime を指定せずにカレンダーの delta リクエストを再現します。リクエストが無効な StartDateTime エラーなしで成功し、パラメーターを指定するリクエストも引き続き動作すれば完了です。