security/py-cryptography: Fix stage QA errors with py-maturin 1.12.0+

• If built with py-maturin 1.12.0+ following stage QA errors are emitted:

[...]

> Running Q/A tests (stage-qa)

Error: Python package installs top-level 'docs/' directory in site-packages
Error: Location: lib/python3.11/site-packages/docs
[...]
Error: Python package installs top-level 'tests/' directory in site-packages
Error: Location: lib/python3.11/site-packages/tests
[...]

• This is because older versions of py-maturin didn't install these stray files due to an bug with the "include" pattern in "pyproject.toml". With version 1.12.0, these files are now installed.

Approved by: portmgr (build fix blanket)

security/py-cryptography: Convert to PATCH_SITES