Pre commit fixes: switch to supported mirrors-prettier, workaround beautysh bug #3705
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Replace pre-commit/mirrors-prettier with rbubley/mirrors-prettier
pre-commit/[email protected] is showing inconsistent behaviour- pre-commit is intermittently pushing unrelated changes to some PRs, and in other cases reporting that changes haven't been made. mirrors-prettier is no longer supported.
This switches to https://github.com/rbubley/mirrors-prettier instead, and downgrades prettier to the last proper release as done in jupyter/docker-stacks#2180