Patchdemo\Catalyst: add use for Throwable

Brennen Bearnesrequested to merge
brennen/use-throwable into main

Looks like I missed this when migrating the class into the Patchdemo namespace.

Maybe responsible for this making it to the client?

Fatal error: Uncaught Symfony\Component\HttpClient\Exception\TimeoutException: Idle timeout reached for "https://api.catalyst.wmcloud.org/api/environments/5192/logs?stream=mediawiki/install-mediawiki". in /var/www/html/vendor/symfony/http-client/Chunk/ErrorChunk.php:62
Stack trace:
#0 /var/www/html/lib/Patchdemo/Catalyst.php(89): Symfony\Component\HttpClient\Chunk\ErrorChunk->isLast()
#1 /var/www/html/lib/Patchdemo/Catalyst.php(228): Patchdemo\Catalyst->Patchdemo\{closure}()
#2 /var/www/html/lib/Patchdemo/Catalyst.php(62): Patchdemo\Catalyst->withErr()
#3 /var/www/html/create.php(590): Patchdemo\Catalyst->streamLogs()
#4 {main} thrown in /var/www/html/vendor/symfony/http-client/Chunk/ErrorChunk.php on line 62

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