getCodes(): generate codes for one more day to work as expected (Date…

…Period does not include end date by default)

src/Repository/BookingCodes.php

@@ -80,6 +80,7 @@ public static function getCodes( int $timeframeId, int $startDate = null, int $e
 			if ( ! $timeframe->getRawEndDate() ) {
 				$startGenerationPeriod = new \DateTime( $startDate );
 				$endGenerationPeriod = new \DateTime( $endDate );
+				$endGenerationPeriod->modify( '+1 days' ); // alternatively, DatePeriod::INCLUDE_END_DATE can be used (PHP>8.2)
 				static::generatePeriod( $timeframe,
 					new DatePeriod(
 						$startGenerationPeriod,