ci: Linux: Set explicit timeout to 3 hours

Author: sniok

.github/workflows/1es-pipeline-linux.yml

@@ -43,6 +43,7 @@ extends:
       - stage: Stage
         jobs:
           - job: HostJob
+            timeoutInMinutes: 180
             # If the pipeline publishes artifacts, use `templateContext` to define the artifacts.
             # This will enable 1ES PT to run SDL analysis tools on the artifacts and then upload them.
             templateContext: