[ruby/open3] Update to match JRuby 9.4

This allows the wrapper functions in the main open3 to be defined
while using our ProcessBuilder logic for the internal popen
implementation.

Note this adds logic to reject redirects from a numeric fd to a
live IO object (or not a String or to_path object) since we cannot
support direct IO redirects with ProcesBuilder.

This patch allows tests to complete with the ProcessBuilder impl.
Only three tests fail:

* test_numeric_file_descriptor2 and test_numeric_file_descriptor2
  fail due to redirecting streams to a pipe IO.
* test_pid fails expecting a real PID which we cannot provide via
  ProcessBuilder.

https://github.com/ruby/open3/commit/73f986c233

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