[ruby-core:116106] [Ruby master Bug#20168] Process won't exit when Ractor.select waiting a Ractor

Issue #20168 has been reported by shia (Sangyong Sim).

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Bug #20168: Process won't exit when Ractor.select waiting a Ractor
https://bugs.ruby-lang.org/issues/20168

* Author: shia (Sangyong Sim)
* Status: Open
* Priority: Normal
* ruby -v: 3.3.0
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
## Reproduction code

```ruby
trap(:INT) do
  puts "SIGINT"
  exit
end

trap(:TERM) do
  puts "SIGTERM"
  exit
end

r = Ractor.new do
  loop do
    sleep 1
  end
end

Ractor.select(r) # stucked.
# SIGINT/SIGTERM sent to Ruby process(confirmed by trap),
# but process won't exit.
```

## Expected behavior

Process killed successfully with exit code 0.

## Affected Ruby version

3.3.0
3.2.x works as expected.



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