Preferably, the key of the license should be "license" and not "license-name" in the extension.json file on line 9 based on the documentation here: https://getcomposer.org/doc/04-schema.md#license.
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Er no...that's the doc for composer.json. It's properly called license-name in extension.json: https://www.mediawiki.org/wiki/Manual:Extension.json/Schema#license-name