WIP: rel/0.5.0

This merge request was triggered by a new tag being added to the fsl/pyfix project.

Accepting this merge request will cause the conda recipe for fsl/pyfix to be updated to version 0.5.0.

If all goes well, a new conda package will built for fsl/pyfix (0.5.0), and will be uploaded to the FSL conda channel.

(MR automatically generated by fsl-ci-rules running on the fsl/pyfix repository).