Install all dependencies in check-code-quality.yml

[mgovers]

TODO: add step before all code quality checks to pip install -e .[dev]

because numpy was not installed in this pipeline, the pipeline did not check mypy on any lines containing numpy arrays (which is quite a lot). as a result, we now did not catch stuff on mypy that we should have caught.

installing numpy into this pipeline enabled checking mypy on lines containing numpy arrays.

now, if, in the future, we also have other dependencies that we want to use in our own mypy checks, we would also have to add those to this pipeline.

However, if we have a step before running any of the code quality checks that does pip install -e .[dev], then all those dev dependencies are already installed automatically, so we don't need to explicitly add them here.

Originally posted by @mgovers in #753 (comment)