[Pythonmac-SIG] Upgrade to pip 9.0.3 (due to TLS deprecation)

[Sumana Harihareswara]

A couple updates:

https://twitter.com/mikeymikey/status/989420449485344768 says

As a reminder to anyone out there that's dealing with the TLS 1.2 cutover on python's pypi on macOS 10.12: You may still get stung by it if you end up unfortunately needing to deal with setuptools / easy_install packages that you can't get through pip.

and publicizes and discusses

a "tlsssl-1.1.0.pkg" package you can install on 10.12 that will hotfix ssl to support TLS 1.1/1.2 in most situations.

And yesterday, Benjamin Peterson announced the release of Python 2.7.15:

https://mail.python.org/pipermail/python-list/2018-May/732755.html

Users of the macOS binaries should note that all python.org macOS installers now ship with a builtin copy of OpenSSL. Additionally, there is a new additional installer variant for macOS 10.9+ that includes a built-in version of Tcl/Tk 8.6. See the installer README for more information.

(Will cross-post to PyPA-dev per
https://groups.google.com/forum/#!topic/pypa-dev/Oz6SGA7gefo .)