Fix logic bug in without extras CI job

Zebedee Nichollsrequested to merge
fix-ci-logic-bug into main

Description

Spotted here https://github.com/openscm/openscm-zenodo/pull/18

Checklist

Please confirm that this pull request has done the following:

  • Tests added
  • Documentation added (where applicable)
  • Changelog item added to changelog/
Edited by Zebedee Nicholls

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