docs: set BS version explicitly for now

[maelle]

r-dbi/dbitemplate#4

[aviator-app]

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This PR is not ready to merge (currently in state blocked): PR cannot be automatically rebased, please rebase manually to continue.

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[krlmlr]

Thanks!

[aviator-app]

This pull request failed to merge: PR cannot be automatically rebased, please rebase manually to continue. Once the issues are resolved, remove the blocked label and re-queue the pull request. Note that the pull request will be automatically re-queued if it has the mergequeue label.

Additional debug info: Failed to rebase this PR onto the latest changes from the base branch. You will probably need to rebase this PR manually and resolve conflicts).