python-cryptography: bump to version 3.4.7

Dropped patches:
  0004-Replace-EVP_CIPHER_CTX_cleanup-with-EVP_CIPHER_CTX_r.patch
  0005-Switch-get_-Update-APIs-to-get0.patch

Reworked patches:
  0001-Add-new-ASN1_STRING_get0_data-API.patch
  0006-Add-X509_STORE_CTX_trusted_stack-compatibility-macro.patch
These 2 require that we keep only the CUSTOMIZATIONS stuff for now. Maybe
later we can drop this.

Ran 'make package/python-cryptography/refresh'.

Added patch:
  0004-disable-rust.patch
upstream did a sloppy job with the CRYPTOGRAPHY_DONT_BUILD_RUST logic; we
need to patch it, to make sure the setuptools-rust isn't installed.
We may need to carry this patch in our tree for a bit longer than upstream,
because in newer versions, CRYPTOGRAPHY_DONT_BUILD_RUST logic gets removed.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

lang/python/python-cryptography/patches/0004-disable-rust.patch

@@ -0,0 +1,20 @@
+--- a/setup.py
++++ b/setup.py
+@@ -11,7 +11,7 @@ import sys
+ from setuptools import find_packages, setup
+ 
+ try:
+-    from setuptools_rust import RustExtension
++    pass
+ except ImportError:
+     print(
+         """
+@@ -45,7 +45,7 @@ setuptools_rust = "setuptools-rust>=0.11
+ install_requirements = ["cffi>=1.12"]
+ setup_requirements = install_requirements + [setuptools_rust]
+ 
+-if os.environ.get("CRYPTOGRAPHY_DONT_BUILD_RUST"):
++if True:
+     rust_extensions = []
+ else:
+     rust_extensions = [