The oldest still-supported version of Blender is 4.2-LTS, which uses
Python 3.11, so that's what's now the required Python version for BAT.
Make the build system depend on `poetry-core` instead of `poetry`, to
make package builds faster (especially important when using Tox for
testing in various environments).
This also re-generates the `poetry.lock` file, so updates the
dependencies to their latest version compatible with the `project.toml`
file.
The logging is sent to stdout already (which is captured and printed by
PyTest), so having PyTest also capture and print logging just doubles
the output.
No functional changes.
This does introduce some not-so-nice things, like having to annotate each
`__init__` function with `-> None`. However, the benefits of having static
type checking in a complex bit of software like BAT outweigh the downsides.
