Duplicate keys in meta.yaml pass linting

[siboehm]

Solution to issue cannot be found in the documentation.

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Issue

See here for an example where I had accidentally had two license_file keys in the yaml: https://github.com/conda-forge/anthropic-feedstock/pull/7/files

Linter never complained, but the automatic update was failing: https://github.com/conda-forge/anthropic-feedstock/actions/runs/5521788943/jobs/10070415071

Installed packages

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Environment info

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