python-cryptography: Update to 2.9, remove setup patch

Since cffi is installed by HOST_PYTHON3_PACKAGE_BUILD_DEPENDS, it
shouldn't be necessary to clear setup_requirements anymore.

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-cryptography/patches/001-disable-setup-requirements.patch

@@ -1,10 +0,0 @@
---- a/setup.py
-+++ b/setup.py
-@@ -243,6 +243,7 @@ class DummyPyTest(test):
- with open(os.path.join(base_dir, "README.rst")) as f:
-     long_description = f.read()
- 
-+setup_requirements=[]
- 
- setup(
-     name=about["__title__"],