[BUG] Bundle report compatibility takes a long time to find incompatible gems

[fbuys]

Expected Behavior

When I run: be bundle_report compatibility --rails-version=8.0.1
I expect it to return within a reasonable time and not consume a large amount of memory.

Actual Behavior

When I run: be bundle_report compatibility --rails-version=8.0.1
It takes more than 40 seconds to find incompatible gems
Using stack prof I can also see it allocated a very large amount of object.

Possible Fix

Use fetcher instead of new when we use Gem::SpecFetcher

To Reproduce

1. Find a relatively old project Rails version older than 6
2. Run bundle_report compatibility --rails-version=8.0.1
3. Notice how much time it take to respond

Additional Information

I will abide by the code of conduct