Use conda-forge version of bilby.cython

This MR updates the dockerfiles to install bilby.cython from conda rather than pypi.

I verified that the images build properly in the CI, see here.

added Infrastructure label

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added 5 commits

• ff4c709b...4fef720b - 4 commits from branch master
• ae49e17d - Merge remote-tracking branch 'origin/master' into conda-bilby-cython

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approved this merge request

merged

mentioned in commit 8515ae00

changed milestone to %1.2.0