python3Packages.cryptography: 2.8 -> 2.9

Backwards incompatible changes:
- Support for Python 3.4 has been removed due to low usage and
  maintenance burden.
- Support for OpenSSL 1.0.1 has been removed. Users on older version of
  OpenSSL will need to upgrade.
- Support for LibreSSL 2.6.x has been removed.
- Reversed the order in which rfc4514_string() returns the RDNs as
  required by RFC 4514.

Note: The first three changes should have no impact on Nixpkgs as we
already removed Python 3.4 and OpenSSL 1.0.1. Additionally we don't
support LibreSSL for this package.

pkgs/development/python-modules/cryptography/vectors.nix

@@ -7,7 +7,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "05pi3shqz0fgvy0d5yazza67bbnam8fkrx2ayrrclgkaqms23lvc";
+    sha256 = "1h7dcgwrjxqk1bzkangbvlhhlgyqd7cfi894dv1cd5m2sp7csblc";
   };
 
   # No tests included
@@ -15,7 +15,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Test vectors for the cryptography package";
-    homepage = https://cryptography.io/en/latest/development/test-vectors/;
+    homepage = "https://cryptography.io/en/latest/development/test-vectors/";
     # Source: https://github.com/pyca/cryptography/tree/master/vectors;
     license = with licenses; [ asl20 bsd3 ];
     maintainers = with maintainers; [ primeos ];