[rubygems/rubygems] Change spec to do the right thing on bundler 3

On bundler 3, the `--deployment` flag doesn't exist, so the `bundle
install --deployment` command was failing silently and the spec was
verifying a different scenario.

Change the spec to work the same regardless of bundler's major version.

Also, from the spec description it was not apparently that a specific
case involving deployment mode was being tested, so I reworded it to
make it more apparent.

https://github.com/rubygems/rubygems/commit/3e33e2b927

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