Invalid mode 0 for existing descriptor N (expected 1) (Errno::EINVAL) on macOS

[eregon]

This happens with assert_separately on macOS on TruffleRuby 22.3.
It's already fixed on master: 448ba1c
So using truffleruby-head/truffleruby-dev fixes this.
This issue is to easily find this information if someone else runs in this issue.

For instance from https://github.com/ruby/openssl/actions/runs/4189906780/jobs/7262770704

5) Failure: test_openssl_engine_digest_sha1(OpenSSL::TestEngine):
  assert_separately failed with error message
  pid 6314 exit 1
  | <internal:core> core/io.rb:913:in `setup': Invalid argument - Invalid mode 0 for existing descriptor 13 (expected 1) (Errno::EINVAL)
  | 	from <internal:core> core/io.rb:947:in `initialize'
  | 	from /Users/runner/work/openssl/openssl/test/lib/core_assertions.rb:247:in `separated_runner'
  | 	from -:4:in `<main>'
  .
  <false> is not true.
/Users/runner/work/openssl/openssl/test/lib/core_assertions.rb:490:in `assert'
/Users/runner/work/openssl/openssl/test/lib/core_assertions.rb:314:in `assert_separately'
/Users/runner/work/openssl/openssl/test/openssl/test_engine.rb:85:in `with_openssl'
/Users/runner/work/openssl/openssl/test/openssl/test_engine.rb:45:in `test_openssl_engine_digest_sha1'
     42:   end
     43: 
     44:   def test_openssl_engine_digest_sha1
  => 45:     with_openssl <<-'end;'
     46:       engine = OpenSSL::Engine.by_id("openssl")
     47:       digest = engine.digest("SHA1")
     48:       assert_not_nil(digest)
<internal:core> core/throw_catch.rb:36:in `catch'
<internal:core> core/throw_catch.rb:36:in `catch'

Also in this form https://github.com/ruby/timeout/actions/runs/4189487236/jobs/7261869962:

 ===============================================================================
Failure: test_handling_enclosed_threadgroup(TestTimeout):
  assert_separately failed with error message
  pid 1849 exit 0
  | <internal:core> core/errno.rb:54:in `handle_errno': Broken pipe (Errno::EPIPE)
  | 	from <internal:core> core/posix.rb:512:in `write_string_native'
  | 	from <internal:core> core/io.rb:2369:in `write'
  | 	from <internal:core> core/truffle/io_operations.rb:67:in `block in puts'
  | 	from <internal:core> core/truffle/io_operations.rb:34:in `each'
  | 	from <internal:core> core/truffle/io_operations.rb:34:in `puts'
  | 	from <internal:core> core/io.rb:1713:in `puts'
  | 	from /Users/runner/work/timeout/timeout/test/lib/core_assertions.rb:251:in `block in separated_runner'
  .
  <false> is not true.
/Users/runner/work/timeout/timeout/test/lib/core_assertions.rb:489:in `assert'
/Users/runner/work/timeout/timeout/test/lib/core_assertions.rb:313:in `assert_separately'
/Users/runner/work/timeout/timeout/test/test_timeout.rb:177:in `test_handling_enclosed_threadgroup'
     174: 
     175:   # https://github.com/ruby/timeout/issues/24
     176:   def test_handling_enclosed_threadgroup
  => 177:     assert_separately(%w[-rtimeout], <<-'end;')
     178:       Thread.new {
     179:         t = Thread.current
     180:         group = ThreadGroup.new
<internal:core> core/throw_catch.rb:36:in `catch'
<internal:core> core/throw_catch.rb:36:in `catch'
===============================================================================