Version 1.11.5

Fixed

• Fixed typos revealed by codespell - thanks to @hectormz for this contribution (#829)
• We updated the dependencies of the jupyterlab-jupytext extension to address several security issues (#842) (#843)
• The Jupytext dev environment (requirements-dev.txt) now uses jupyterlab==3.0.17 rather than 3.0.0 because of another security issue (#839)