Update Python tracking to support scoped IPv6 addresses

[jamver]

Please update the package to include the recently added support for IPv6 Scoped Literal Addresses added to Python3.9a5 python/cpython@21da76d.

The IPv6 address Wikipedia article has a good description of scoped literal IPv6 addresses — Scoped literal addresses are IPv6 address appended by '%' and a scope or zone id value — typically an interface numeric identifier on Windows and an interface name on Unix-based systems.

Testing using phihag/ipaddress@ d8aef06 version 1.0.23 (latest):

Python 2.7.9 (default, Sep 14 2019, 20:00:08)
[GCC 4.9.2] on linux2

>>> import ipaddress

>>> ipaddress.ip_address(u'::1')
IPv6Address(u'::1')

>>> ipaddress.ip_address(u'::1%1')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "ipaddress.py", line 168, in ip_address address)
ValueError: u'::1%1' does not appear to be an IPv4 or IPv6 address

Testing using python/cpython@dcd4c4f version 3.9.0a5:

Python 3.9.0a5 (v3.9.0a5:dcd4c4f9c9, Mar 23 2020, 14:59:02)
[Clang 6.0 (clang-600.0.57)] on darwin

>>> import ipaddress

>>> ipaddress.ip_address(u'::1')
IPv6Address('::1')

>>> ipaddress.ip_address(u'::1%1')
IPv6Address('::1%1')

(For background, this is normal behaviour for Python's socket.socket.accept(), which is a transliteration of the underlying system call. On Unix-based systems (such as Linux), sockaddr_storage (sockaddr_in6 from ip6(7)) includes sin6_scope_id (ifr_ifindex from netdevice(7)), and is returned as the interface name (represented as %ifr_ifname) when being returned as a string by the Python2.7 sockets library (python/cpython@7a41638 2.7.18rc1/Modules/socketmodule.c#L1366).