Tor sim timeout 24h -> 72h

It looks like the timeout starts when the job is queued, not when it's
started. e.g.
https://gitlab.torproject.org/jnewsome/sponsor-61-sims/-/jobs/39753
appears to have timed out before it even had a chance to start.

.gitlab-ci.yml

@@ -317,7 +317,7 @@ tornettools-stage:
     # For debugging
     - find $CI_PROJECT_DIR -type f -exec ls -s --block-size=1K \{\} \;
 
-  timeout: 24h
+  timeout: 72h
   artifacts:
     paths:
       - sysinfo