Prevent "Violation of PRIMARY KEY constraint" errors

After applying the update to address deadlocks found in https://www.drupal.org/project/sqlsrv/issues/3106869, I began occasionally seeing "Violation of PRIMARY KEY constraint" errors. After chatting with @Beakerboy in that issue, he supplied an update (see https://www.drupal.org/project/sqlsrv/issues/3106869#comment-13558073) to Upsert.php which appears to have addressed this issue. I will shortly be creating a patch for that supplied code and attaching here.