Added the syrian holidays

src/Countries/Syria.php

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+<?php
+
+namespace Spatie\Holidays\Countries;
+
+use Carbon\CarbonImmutable;
+
+class Syria extends Country
+{
+    public function countryCode(): string
+    {
+        return 'sy';
+    }
+
+    protected function allHolidays(int $year): array
+    {
+        return array_merge([
+            'New Year\'s Day' => '01-01',
+            'Mother\'s Day' => '03-21',
+            'Independence Day' => '04-17',
+            'Labor' => '05-01',
+            'Martyrs\' Day' => '05-06',
+            'Anniversary of the October War' => '10-06',
+            'Christmas' => '12-25',
+
+        ], $this->variableHolidays($year));
+    }
+
+    /** @return array<string, CarbonImmutable|string> */
+    protected function variableHolidays(int $year): array
+    {
+        $easter = CarbonImmutable::createFromTimestamp(easter_date($year))
+            ->setTimezone('Asia/Damascus');
+
+        // TODO: Implement islamic holidays
+
+        return [
+            'Western Easter' => $easter,
+            'Eastern Easter' => $easter->addDays(35),
+        ];
+    }
+}

tests/.pest/snapshots/Countries/SyriaTest/it_can_calculate_syrian_holidays.snap

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+[
+    {
+        "name": "New Year's Day",
+        "date": "2024-01-01"
+    },
+    {
+        "name": "Mother's Day",
+        "date": "2024-03-21"
+    },
+    {
+        "name": "Western Easter",
+        "date": "2024-03-31"
+    },
+    {
+        "name": "Independence Day",
+        "date": "2024-04-17"
+    },
+    {
+        "name": "Labor",
+        "date": "2024-05-01"
+    },
+    {
+        "name": "Eastern Easter",
+        "date": "2024-05-05"
+    },
+    {
+        "name": "Martyrs' Day",
+        "date": "2024-05-06"
+    },
+    {
+        "name": "Anniversary of the October War",
+        "date": "2024-10-06"
+    },
+    {
+        "name": "Christmas",
+        "date": "2024-12-25"
+    }
+]

tests/Countries/SyriaTest.php

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+<?php
+
+namespace Spatie\Holidays\Tests\Countries;
+
+use Carbon\CarbonImmutable;
+use Spatie\Holidays\Holidays;
+
+it('can calculate syrian holidays', function () {
+    CarbonImmutable::setTestNowAndTimezone('2024-01-01');
+
+    $holidays = Holidays::for(country: 'sy')->get();
+
+    expect($holidays)
+        ->toBeArray()
+        ->not()->toBeEmpty();
+
+    expect(formatDates($holidays))->toMatchSnapshot();
+});