chore(deps-dev): bump cohere from 5.8.1 to 5.15.0

[dependabot[bot]]

Bumps cohere from 5.8.1 to 5.15.0.

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Greptile Summary

Disclaimer: Experimental PR review

Updates the development dependency cohere from version 5.8.1 to 5.15.0, with automated dependency management handled by Dependabot configuration.

• Dependabot is configured for daily pip package updates in /.github/dependabot.yml
• Auto-merge enabled for patch version updates in /.github/workflows/dependabot-merge.yml
• Cohere is listed as a dev dependency in pyproject.toml with version constraint >=4.46,<6.0
• Automated rebase workflow configured in /.github/workflows/dependabot-rebase-stale.yml for stale PRs

Note Automatic rebases have been disabled on this pull request as it has been open for over 30 days.