PHP Parse Error in object-cache.php

Hello,
I am getting parse errors in some sites:

PHP Parse error: syntax error, unexpected ‘?’ in C:\inetpub\wwwroot\asdf\wp-content\object-cache.php on line 1242

The lines 1240-1242 are:

$results = array_map( function ( $response ) {
  return (bool) $this->parse_redis_response( $response );
}, $tx->{$method}() ?? [] );