The repo is set up to use mise to install required tools. Once mise is installed, changing into this directory should install the correct tools with the right versions. If not, run mise install to install everything.
After that, running pdm install should install the dependencies. Then doit build_jb will build the book.
If you want to work on the book, you may also need to install Julia dependencies. mise should install Julia. Running julia --project=. -e 'using Pkg; Pkg.instantiate(); Pkg.precompile();' should install dependencies in a local project.