Lower timeout of upload stash -> image scaler requests

This should let us establish if something higher in the chain of requests
is timing out too early compared to this internal request. The default of
25 seconds seems unreasonable anyway for a regular web request.

Bug: T90599
Change-Id: I06dbf25cd2b1a664ff18682ecbbd73719113d36d

includes/specials/SpecialUploadStash.php

@@ -250,7 +250,7 @@ class SpecialUploadStash extends UnlistedSpecialPage {
 		// make a curl call to the scaler to create a thumbnail
 		$httpOptions = array(
 			'method' => 'GET',
-			'timeout' => 'default'
+			'timeout' => 5 // T90599 attempt to time out cleanly
 		);
 		$req = MWHttpRequest::factory( $scalerThumbUrl, $httpOptions, __METHOD__ );
 		$status = $req->execute();