gh-135953: Avoid BytesWarning when sampling profiler tests fail (GH-141719)

With `-bb`, this failed on BytesWarning: str() on a bytes instance

diff --git a/Lib/test/test_profiling/test_sampling_profiler/helpers.py b/Lib/test/test_profiling/test_sampling_profiler/helpers.py
index abd5a7377ad68e355e01d11d0005e5190c00816c..f1c01afd0fa555c9317e6578044c2218fab5aafa 100644 (file)
--- a/Lib/test/test_profiling/test_sampling_profiler/helpers.py
+++ b/Lib/test/test_profiling/test_sampling_profiler/helpers.py
@@ -83,7 +83,7 @@ _test_sock.sendall(b"ready")
         response = client_socket.recv(1024)
         if response != b"ready":
             raise RuntimeError(
-                f"Unexpected response from subprocess: {response}"
+                f"Unexpected response from subprocess: {response!r}"
             )
 
         yield SubprocessInfo(proc, client_socket)