Update endurance.yml

Author: JohnSully

.github/workflows/endurance.yml

@@ -18,5 +18,5 @@ jobs:
     - name: test-multithread (5X)
       run: |
         sudo apt-get install -y tcl8.5
-        ./runtest --loopn 5 --config server-threads 3 --clients 5
+        ./runtest --loopn 3 --config server-threads 3 --clients 5