Improve the independence of bundler specs from rubygems #3995
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What was the end-user or developer problem that led to this PR?
While creating the release PR for the next bundler version, I got a failure because I hadn't backport a rubygems PR. I shouldn't need to backport any rubygems specific PRs to get the CI green on the stable branch.
What is your fix for the problem, implemented in this PR?
I made the spec detect whether the rubygems version it's running against has the fix it needs, and skip the spec otherwise.
Also, since the :rubygems filter was unused, I removed it, since I feel it's best to always do this kind of feature detection rather than hardcoding version checks.
Make sure he following tasks are checked