Log:
[ruby/rubygems] Prevent checksum for this test:
- ### Problem
This test breaks whenever checksums are computed. It didn't break
before because the gemfile in this test doesn't include any gems
(only git gems) and therefore checksum is skipped.
I'm being unlucky and it now fails because we compute a checksum
for the "bundler" gem itself. Computing a checksum requires
"rubygems/package", and down the line requires "digest".
### Solution
For the sake of shipping this PR, I'm going to go workaround the
problem and skip checksum so that "digest" is not loaded.