[rubygems/rubygems] Handled unknown gems in bundled gems warning

We have this code that started failing on 3.3.0-dev recently:

```
irb(main):002> require File.join(RbConfig::CONFIG["rubylibdir"], "observer.rb")
/opt/rubies/3.3.0-dev-09-29/lib/ruby/3.3.0+0/bundled_gems.rb:86:in `<': comparison of String with nil failed (ArgumentError)

    end + " which #{RUBY_VERSION < SINCE[gem] ? "will be" : "is"} not part of the default gems since Ruby #{SINCE[gem]}"
                                   ^^^^^^^^^^
	from /opt/rubies/3.3.0-dev-09-29/lib/ruby/3.3.0+0/bundled_gems.rb:86:in `warning?'
	from /opt/rubies/3.3.0-dev-09-29/lib/ruby/3.3.0+0/bundled_gems.rb:92:in `block in <module:BUNDLED_GEMS>'
	from <internal:/opt/rubies/3.3.0-dev-09-29/lib/ruby/3.3.0+0/rubygems/core_ext/kernel_require.rb>:42:in `block in require'
	from <internal:/opt/rubies/3.3.0-dev-09-29/lib/ruby/3.3.0+0/rubygems/core_ext/kernel_require.rb>:39:in `synchronize'
	from <internal:/opt/rubies/3.3.0-dev-09-29/lib/ruby/3.3.0+0/rubygems/core_ext/kernel_require.rb>:39:in `require'
	from (irb):2:in `<main>'
	from <internal:kernel>:187:in `loop'
	from /opt/rubies/3.3.0-dev-09-29/lib/ruby/gems/3.3.0+0/gems/irb-1.8.1/exe/irb:9:in `<top (required)>'
	from /Users/byroot/.gem/ruby/3.3.0/bin/irb:25:in `load'
	from /Users/byroot/.gem/ruby/3.3.0/bin/irb:25:in `<main>'
```

https://github.com/rubygems/rubygems/commit/d67eddb295

0 files changed, 0 insertions, 0 deletions