Remove Whitsunday (pentecost) from Austria

It's not a holiday: https://en.wikipedia.org/wiki/Public_holidays_in_Austria
https://de.wikipedia.org/wiki/Feiertage_in_%C3%96sterreich


Signed-off-by: Felix Frey <felix.frey@gmx.at>

Author: felixfrey

src/Yasumi/Provider/Austria.php

@@ -55,7 +55,6 @@ public function initialize(): void
         $this->addHoliday($this->easterMonday($this->year, $this->timezone, $this->locale));
         $this->addHoliday($this->internationalWorkersDay($this->year, $this->timezone, $this->locale));
         $this->addHoliday($this->ascensionDay($this->year, $this->timezone, $this->locale));
-        $this->addHoliday($this->pentecost($this->year, $this->timezone, $this->locale, Holiday::TYPE_OBSERVANCE));
         $this->addHoliday($this->pentecostMonday($this->year, $this->timezone, $this->locale));
         $this->addHoliday($this->corpusChristi($this->year, $this->timezone, $this->locale, Holiday::TYPE_OFFICIAL));
         $this->addHoliday($this->allSaintsDay($this->year, $this->timezone, $this->locale));