Change fputcsv $eol default arg from PHP_EOL to "\n"

Author: bmewburn

standard/standard_6.php

@@ -663,7 +663,7 @@ function fputcsv(
     string $separator = ",",
     string $enclosure = '"',
     #[PhpStormStubsElementAvailable(from: '7.0')] string $escape = "\\",
-    #[PhpStormStubsElementAvailable('8.1')] string $eol = PHP_EOL
+    #[PhpStormStubsElementAvailable('8.1')] string $eol = "\n"
 ): int|false {}
 
 /**