[Intl] Remove incorrect condition in CurrencyDataGenerator::icuPairToDate

1 << 63 === PHP_INT_MIN we cannot have a lower int value

1 << 64 === 0 so the removing this value doesn't change anything

Fix psalm crash due to bug vimeo/psalm#11209

When doing PHP_INT_MIN - 1, the value is converted to a float that breaks the type system of psalm https://github.com/vimeo/psalm/blob/279f3eab037923d3f9d3ea3de1a16b425653e30c/src/Psalm/Internal/Type/SimpleAssertionReconciler.php#L2073

Author: GromNaN

src/Symfony/Component/Intl/Data/Generator/CurrencyDataGenerator.php

@@ -236,11 +236,6 @@ private static function icuPairToDate(array $pair): string
         // Recompose a 64-bit unsigned integer from two 32-bit chunks.
         $unsigned64 = ((($highBits32 & 0xFFFFFFFF) << 32) | ($lowBits32 & 0xFFFFFFFF));
 
-        // Convert to signed 64-bit (two's complement) if sign bit is set.
-        if ($unsigned64 >= (1 << 63)) {
-            $unsigned64 -= (1 << 64);
-        }
-
         // Split into seconds and milliseconds.
         $seconds = intdiv($unsigned64, 1000);
         $millisecondsRemainder = $unsigned64 - $seconds * 1000;