Pin grabbit and pybids
Pin grabbit and pybids

Closes #1279
oesteban/fmriprep,oesteban/fmriprep,poldracklab/preprocessing-workflow,poldracklab/fmriprep,poldracklab/fmriprep,oesteban/preprocessing-workflow,poldracklab/preprocessing-workflow,poldracklab/fmriprep,oesteban/fmriprep,oesteban/preprocessing-workflow