fix(CI): shall wait before stop the local testnet

.github/workflows/memcheck.yml

@@ -297,6 +297,9 @@ jobs:
         run: pgrep safenode | wc -l
         if: always()
 
+      - name: Wait before verifying reward forwarding
+        run: sleep 300
+
       - name: Stop the local network and upload logs
         if: always()
         uses: maidsafe/sn-local-testnet-action@main
@@ -415,14 +418,11 @@ jobs:
           echo "Total swarm_driver long handling duration is: $total_long_handling ms"
           echo "Total average swarm_driver long handling duration is: $average_handling_ms ms"
 
-      - name: Wait before verifying reward forwarding
-        run: sleep 120
-
       - name: Verify reward forwarding using rg
         shell: bash
         timeout-minutes: 1
         run: |
-          min_reward_forwarding_times="150"
+          min_reward_forwarding_times="120"
           reward_forwarding_count=$(rg "Reward forwarding completed sending spend" $NODE_DATA_PATH -c --stats | \
             rg "(\d+) matches" | rg "\d+" -o)
           echo "Carried out $reward_forwarding_count reward forwardings"