[ruby-core:108616] [Ruby master Bug#18790] cannot load such file -- digest (LoadError)

Issue #18790 has been reported by k0kubun (Takashi Kokubun).

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Bug #18790: cannot load such file -- digest (LoadError)
https://bugs.ruby-lang.org/issues/18790

* Author: k0kubun (Takashi Kokubun)
* Status: Assigned
* Priority: Normal
* Assignee: hsbt (Hiroshi SHIBATA)
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
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I got asked by @hsbt to file this. 

## Backtrace

```
configuring psych
/home/k0kubun/src/github.com/ruby/ruby/tool/extlibs.rb:7:in `require': cannot load such file -- digest (LoadError)
        from /home/k0kubun/src/github.com/ruby/ruby/tool/extlibs.rb:7:in `<top (required)>'
        from /home/k0kubun/src/github.com/ruby/ruby/ext/psych/extconf.rb:24:in `require_relative'
        from /home/k0kubun/src/github.com/ruby/ruby/ext/psych/extconf.rb:24:in `<top (required)>'
        from ../ext/extmk.rb:217:in `load'
        from ../ext/extmk.rb:217:in `block in extmake'
        from /home/k0kubun/src/github.com/ruby/ruby/lib/mkmf.rb:324:in `open'
        from ../ext/extmk.rb:213:in `extmake'
        from ../ext/extmk.rb:577:in `block in <main>'
        from ../ext/extmk.rb:573:in `each'
        from ../ext/extmk.rb:573:in `<main>'
make[1]: *** [ext/configure-ext.mk:105: ext/psych/exts.mk] Error 1
make[1]: Leaving directory '/home/k0kubun/src/github.com/ruby/ruby/.ruby'
make: *** [uncommon.mk:289: exts.mk] Error 2
```

## How to reproduce
Build ruby without libyaml-dev (?). My build was fixed once I run the apt-get command written in https://github.com/rbenv/ruby-build/wiki, which was probably auto-removed when I upgraded Ubuntu 20.04 to 22.04.



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