Httplib2

IMPORTANT cacerts: remove expired DST Root CA X3, add ISRG Root X1, X2
https://github.com/httplib2/httplib2/pull/200
https://github.com/httplib2/httplib2/issues/203

tls: accept min/max ssl.TLSVersion enum values
https://github.com/httplib2/httplib2/pull/191

setup(python_requires=...) may need setuptools update
https://github.com/httplib2/httplib2/pull/195

auth header parsing performance optimizations; Thanks to Paul McGuire

Use mock from the standard library on Python>=3.3

auth: parse headers using pyparsing instead of regexp
https://github.com/httplib2/httplib2/pull/182

auth: WSSE token needs to be string not bytes
https://github.com/httplib2/httplib2/pull/179

explicit build-backend workaround for pip build isolation bug
"AttributeError: 'module' object has no attribute '__legacy__'" on pip install
https://github.com/httplib2/httplib2/issues/169

IMPORTANT security vulnerability CWE-93 CRLF injection
Force %xx quote of space, CR, LF characters in uri.
Special thanks to Recar https://github.com/Ciyfly for discrete notification.
https://cwe.mitre.org/data/definitions/93.html

Ship test suite in source dist
https://github.com/httplib2/httplib2/pull/168