attempt to calm down restarter job

Author: EricWF

.github/workflows/libcxx-restart-preempted-jobs.yaml

@@ -36,7 +36,7 @@ jobs:
             // the "higher priority" message comes from github canceling a workflow because the user updated the change.
             // And the "exit code 1" message indicates a genuine failure.
             const failure_regex = /(Process completed with exit code 1.)|(Canceling since a higher priority waiting request)|(The run was canceled by)/
-            const preemption_regex = /(The runner has received a shutdown signal)|(The operation was canceled)/
+            const preemption_regex = /(The runner has received a shutdown signal)/
 
             const wf_run = context.payload.workflow_run
             core.notice(`Running on "${wf_run.display_title}" by @${wf_run.actor.login} (event: ${wf_run.event})\nWorkflow run URL: ${wf_run.html_url}`)