[rubygems/rubygems] (Further) Improve Bundler::Settings#[] performance and memory usage

I previously identified and improved this method over in https://github.com/rubygems/rubygems/pull/6884
but while reviewing another memory_profiler profile, I realized another
gain we can eek out.

This method keeps comes up in part because `configs` is allocating a new
Hash every time. My last change took advantage of that by using `map!`
on it. `configs` is called quite often, including in this `[]` method,
so there's a benefit to memoizing it.

Back in `[]`, logically we are trying to find the first Hash in `configs`
that has a value for the given key. Currently, we end up `map` and
`compact` to just get that value.

Instead, we can use a loop over `configs`, and break when we find the
value for the key.

https://github.com/rubygems/rubygems/commit/b913cfc87b

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