[ruby/rubygems] Skip bundler self-checksum on ruby-core in test

fixtures
(https://github.com/ruby/rubygems/pull/9506)

* Skip bundler self-checksum on ruby-core in test fixtures

In ruby-core test setup, bundler is loaded as a default gem and the
bundler.gem cache file is not present on disk where
LockfileGenerator#bundler_checksum looks for it. As a result, the
generator omits the bundler checksum from the regenerated lockfile,
while the test's checksums_section helper still adds it, making the
"does not change the lock" expectations in setup_spec.rb fail on
ruby-core CI for release branches (where Bundler::VERSION does not end
in .dev). Mirror the generator's give-up conditions in the helper so
that test fixtures and the regenerated lockfile stay in sync.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

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https://github.com/ruby/rubygems/commit/40112f7663

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

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