Use ruby to suppress a warning message by cmd.exe

It is expected that reading from command with offset fails by ESPIPE
and the pipe will be closed immediately.  While this causes the child
process to terminate by SIGPIPE usually, cmd.exe yields the message
bellow.

```
The process tried to write to a nonexistent pipe.
```

1 files changed, 1 insertions, 1 deletions

diff --git a/test/ruby/test_io.rb b/test/ruby/test_io.rb
index ce81286c4d..8b4dc1ed98 100644
--- a/test/ruby/test_io.rb
+++ b/test/ruby/test_io.rb
@@ -2543,7 +2543,7 @@ class TestIO < Test::Unit::TestCase
     end
     assert_raise(Errno::ESPIPE) do
       assert_deprecated_warning(/IO process creation with a leading '\|'/) do # https://bugs.ruby-lang.org/issues/19630
-        IO.read("|echo foo", 1, 1)
+        IO.read("|#{EnvUtil.rubybin} -e 'puts :foo'", 1, 1)
       end
     end
   end