Make process timeout 10 minutes instead of default 5

When Drupal core is unzipped there's a notice of a 300 second timeout, then it switches
to the ZipArchive class; there's speculation that later errors that don't specify the
timeout but also result in unzip failures.  See:

https://stackoverflow.com/questions/28177019/composer-exceeded-the-timeout-of-300-seconds-while-installing-sylius-on-composer
https://www.drupal.org/project/drupal/issues/3000865

composer.json

@@ -105,6 +105,7 @@
 	}
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "process-timeout": 600
     }
 }