sync_default_gems.yml: Experiment with fetch-depth: 1

At the moment, we're not sure which gem relies on past renames. So we
try this, and revert it if it turns out to be necessary.

Given that it slows down every single sync, however, I'm thinking of
making tool/sync_default_gems.rb responsible for implementing all
necessary renames on cherry-picks using filter-branch (or any
modification on commits before pushing them).

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