Update black version

Due to an issue with the click package, the black version should be updated - see https://github.com/psf/black/issues/2964.

Note that in this version of black, the requirements for the power operator "**" mean it no longer want spaces either side of it.

added 1 commit

• 071c6631 - Run black on various files to fix new way of formatting power operator

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Thanks @matthew-pitkin, it looks like the failing docs are due to https://github.com/sphinx-doc/sphinx/issues/10289 / https://github.com/jupyter/nbconvert/issues/1736.

This has been resolved as part of broader fixes to the CI in ff6de208.

closed