net/py-urllib3: Update to 1.25.6

• Convert the RUN_DEPENDS into separate OPTIONS as they are listed as extra dependencies in setup.py. Also set those as default that contain the previous RUN_DEPENDS to allow a clean transition.

• Remove the Python-specific version limitation for security/py-certifi because it's required for all Python versions.

• Also remove the info about the broken IPv6 support of net/py-socks (was broken in 1.5.7) and the relevant patch as both are obsolete.

• Update the TEST_DEPENDS and add a "do-test" target to make future QA easier.

Please note that a MFH won't be done as it didn't get an approval because
there are too much changes to make it work in the 2019Q4 branch. [1]

Notable changes since 1.22:

• Require and validate certificates by default when using HTTPS.

• Add mitigation for BPO-37428 affecting Python < 3.7.4 and OpenSSL 1.1.1+ which caused certificate verification to be enabled when using "cert_reqs=CERT_NONE".

• Add TLSv1.3 support to CPython, pyOpenSSL and SecureTransport "SSLContext" implementations.

https://github.com/urllib3/urllib3/blob/1.25.6/CHANGES.rst

Exp-run by: antoine
PR: 229322 [1]
Reported by: Patrice Clement <monsieurp@gentoo.org>
Security: 87270ba5-03d3-11ea-b81f-3085a9a95629