Add -s to all update_suite-s in unlocked opam-install job

This is just for consistency. Other CI jobs allow parallel runs still.

Author: sim642

.github/workflows/unlocked.yml

@@ -193,13 +193,13 @@ jobs:
         run: ruby scripts/update_suite.rb group apron-mukherjee -s
 
       - name: Test marshal regression
-        run: ruby scripts/update_suite.rb -m
+        run: ruby scripts/update_suite.rb -m -s
 
       - name: Test incremental regression
-        run: ruby scripts/update_suite.rb -i
+        run: ruby scripts/update_suite.rb -i -s
 
       - name: Test incremental regression with cfg comparison
-        run: ruby scripts/update_suite.rb -c
+        run: ruby scripts/update_suite.rb -c -s
 
   gobview:
     strategy: