Fix TestInternalNonBlockingWriteWithDeadline(t

The test was relying on sending so big a message that the write blocked.
However, it appears that on Windows the TCP connections over localhost
have an very large or infinite sized buffer. Change the test to simply
set the deadline to the current time before triggering the write.

Author: jackc

internal/nbconn/nbconn_test.go

@@ -313,7 +313,7 @@ func TestInternalNonBlockingWriteWithDeadline(t *testing.T) {
 		require.NoError(t, err)
 		require.EqualValues(t, deadlockSize, n)
 
-		err = conn.SetDeadline(time.Now().Add(100 * time.Millisecond))
+		err = conn.SetDeadline(time.Now())
 		require.NoError(t, err)
 
 		err = conn.Flush()