Remove dead code.

Author: dereuromark

src/Decimal.php

@@ -463,9 +463,6 @@ public function mod(self|string|int $value, ?int $scale = null): static
         if ($scale === null) {
             $scale = $this->scale();
         }
-        if (version_compare(PHP_VERSION, '7.2') < 0) {
-            return new static(bcmod($this, (string)$value));
-        }
 
         return new static(bcmod($this, (string)$value, $scale));
     }

tests/DecimalTest.php

@@ -891,7 +891,7 @@ public function testMultiplyLegacy($a, $b, ?int $scale, string $expected): void
     public static function multiplicationLegacyProvider(): array
     {
         return [
-            ['0', '0', 3, version_compare(PHP_VERSION, '7.3') < 0 ? '0' : '0.000'],
+            ['0', '0', 3, '0.000'],
         ];
     }