new_proposal.py: could not request reviewer: 'carbon-language/carbon-leads'

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I tried to create a new proposal and I got the following error:

 RUNNING: /usr/bin/gh pr create --draft --label proposal --project Proposals --reviewer carbon-language/carbon-leads --repo carbon-language/carbon-lang --title 'Multidimensional array' --body 'TODO: add summary and links here'
Warning: 1 uncommitted change
could not request reviewer: 'carbon-language/carbon-leads' not found
ERROR: Command failed: /usr/bin/gh pr create --draft --label proposal --project Proposals --reviewer carbon-language/carbon-leads --repo carbon-language/carbon-lang --title 'Multidimensional array' --body 'TODO: add summary and links here'

After removing --reviewer carbon-language/carbon-leads, PR was successfully created.

My version of gh is:

$ gh --version
gh version 2.14.2 (2022-07-15)
https://github.com/cli/cli/releases/tag/v2.14.2