python-cryptography: bump to 46.0.6

python-cryptography: bump to 46.0.6

Starting with 46.x, cryptography switched its build backend from
setuptools-rust to maturin. Update PKG_BUILD_DEPENDS accordingly:
replace python-setuptools-rust/host with python-maturin/host and
python-setuptools/host (setuptools is still required by cffi).

Drop 001-Update-ouroboros.patch: the ouroboros crate is no longer a
dependency in 46.x, so the patch (which bumped it from 0.15 to 0.18
to fix RUSTSEC-2023-0042) no longer applies.

Signed-off-by: Alexandru Ardelean <redacted>