Remove the deprecated bundler-checksum gem

What does this MR do and why?

Remove the deprecated bundler-checksum gem

GitLab 19.0 switched to native Bundler checksum verification (!230459 (merged)), and the bundler:gemfile:sync task no longer calls into bundler-checksum. The gem has had require: false and no remaining callers since then, so remove it and its CI job entirely.

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