[skip ci][cmake] Adjust timeout for Navier Stokes test

cmake/modules/GeneratedSystemtests.cmake

@@ -96,7 +96,7 @@ function(dune_add_formcompiler_system_test)
                )
 
       set_tests_properties(${tname} PROPERTIES SKIP_RETURN_CODE 77)
-      set_tests_properties(${tname} PROPERTIES TIMEOUT 60)
+      set_tests_properties(${tname} PROPERTIES TIMEOUT 120)
     endif()
   endforeach()
 endfunction()