Fix print conda pins script

Zebedee Nichollsrequested to merge
print-pins-script into main

Description

Based on https://github.com/openscm/pandas-openscm/pull/34

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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