Wait 10 seconds instead of 3 seconds

5 seconds is not enough time to wait. See https://github.com/ruby/debug/actions/runs/3514525114/jobs/5888644746#step:4:29

Author: ono-max

test/support/test_case.rb

@@ -121,7 +121,7 @@ def wait_pid pid, sec
     end
 
     def kill_safely pid, name, test_info
-      return if wait_pid pid, 3
+      return if wait_pid pid, TIMEOUT_SEC
 
       test_info.failed_process = name