[ruby-core:116015] [Ruby master Bug#20149] Fix memory leak in IPSocket rb_getaddrinfo

Issue #20149 has been reported by HParker (Adam Hess).

----------------------------------------
Bug #20149: Fix memory leak in IPSocket rb_getaddrinfo
https://bugs.ruby-lang.org/issues/20149

* Author: HParker (Adam Hess)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
PR: https://github.com/ruby/ruby/pull/9413

Fixes a memory leak pthread_attr is created, but never cleaned up

```
require 'socket'

10.times do
  10_000.times do
    IPSocket.getaddress("localhost")
  end

  puts `ps -o rss= -p #{$$}`
end
```

before:

```
26744
33400
39928
46328
53240
59640
66168
72696
79352
85880
```

after:

```
20864
20864
20864
20864
20864
20992
20992
20992
20992
21120
```

This likely needs a backport to Ruby 3.3 series.



-- 
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