Migrate mypy configuration into pyproject.toml

[robin-nitrokey]

Since mypy 9.000, the mypy configuration can be specified in
pyproject.toml. This format is much more legible as modules can be
specified as an array instead of concatenating them into one line.
There are also other improvements in the newer mypy versions.
Therefore, this patch bumps the minimum mypy version and moves the mypy
configuration into pyproject.toml. This does not affect the end user as
mypy is development dependency.

[szszszsz]

Q: do we use two different USB libraries here (e.g. through dependency)?

[robin-nitrokey]

In pynitrokey itself, we use usb (= pyusb package) for fido2 and start and usb1 (= libusb1 package) for pro and storage. Also, our nkdfu dependency requires usb1 while pyocd/spsdk requires usb.

$ grep "import usb" -r pynitrokey
pynitrokey/fido2/__init__.py:import usb
pynitrokey/fido2/dfu.py:import usb._objfinalizer
pynitrokey/fido2/dfu.py:import usb.core
pynitrokey/fido2/dfu.py:import usb.util
pynitrokey/cli/pro.py:    import usb1
pynitrokey/cli/storage.py:import usb1
pynitrokey/start/usb_strings.py:import usb
pynitrokey/start/gnuk_token.py:import usb
pynitrokey/start/upgrade_by_passwd.py:    import usb

$ grep "from usb" -r pynitrokey
pynitrokey/cli/start.py:from usb.core import USBError

$ pipdeptree --reverse --packages libusb1,pyusb
libusb1==3.0.0
  - nkdfu==0.1 [requires: libusb1>=1.9.3]
    - pynitrokey==0.4.21 [requires: nkdfu]
pyusb==1.2.1
  - pynitrokey==0.4.21 [requires: pyusb]
  - pyocd==0.31.0 [requires: pyusb>=1.2.1,<2.0]
    - spsdk==1.6.3 [requires: pyocd>=0.28.3,<=0.31.0]
      - pynitrokey==0.4.21 [requires: spsdk>=1.6.0,<1.7.0]