Fix phpstan Ternary operator condition is always true.

src/Countries/Tunisia.php

@@ -3,7 +3,6 @@
 namespace Spatie\Holidays\Countries;
 
 use Carbon\CarbonImmutable;
-use RuntimeException;
 
 class Tunisia extends Country
 {
@@ -372,8 +371,7 @@ protected function getIslamicHolidays(
         if ($year != 1970) {
             $previousHoliday = is_array($holidays[$year - 1]) ? $holidays[$year - 1][1] : $holidays[$year - 1];
 
-            $previousHoliday = CarbonImmutable::createFromFormat('Y-m-d', ($year - 1) . '-' . $previousHoliday)
-                ?: throw new RuntimeException('Date could not be created.');
+            $previousHoliday = CarbonImmutable::createFromFormat('Y-m-d', ($year - 1) . '-' . $previousHoliday);
 
             if ($previousHoliday->addDays($day - 1)->year == $year) {
                 $islamicHolidays = $this->prepareHolidays(
@@ -389,8 +387,7 @@ protected function getIslamicHolidays(
         $currentYearHolidays = is_array($holidays[$year]) ? $holidays[$year] : [$holidays[$year]];
 
         foreach ($currentYearHolidays as $currentYearHoliday) {
-            $currentYearHoliday = CarbonImmutable::createFromFormat('Y-m-d', "$year-$currentYearHoliday")
-                ?: throw new RuntimeException('Date could not be created.');
+            $currentYearHoliday = CarbonImmutable::createFromFormat('Y-m-d', "$year-$currentYearHoliday");
 
             $islamicHolidays = array_merge($islamicHolidays, $this->prepareHolidays(
                 holiday: $currentYearHoliday,
@@ -405,8 +402,7 @@ protected function getIslamicHolidays(
         if ($year != 2037) {
             $nextHoliday = is_array($holidays[$year + 1]) ? $holidays[$year + 1][1] : $holidays[$year + 1];
 
-            $nextHoliday = CarbonImmutable::createFromFormat('Y-m-d', ($year + 1) . '-' . $nextHoliday)
-                ?: throw new RuntimeException('Date could not be created.');
+            $nextHoliday = CarbonImmutable::createFromFormat('Y-m-d', ($year + 1) . '-' . $nextHoliday);
 
             if ($nextHoliday->addDays(-1)->year == $year) {
                 $islamicHolidays = array_merge($islamicHolidays, $this->prepareHolidays(