Fix up conda pinning

Zebedee Nichollsrequested to merge
fix-up-conda-locking into main

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Checklist

Please confirm that this pull request has done the following:

  • (N/A) Tests added
  • (N/A) Documentation added (where applicable)
  • Changelog item added to changelog/

@lewisjarednz @mikapfl I doubt you were using this already, but just in case

Edited by Zebedee Nicholls

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