August 2021 security backports
Here are the patches for two secbugs found in Python 3:
- bpo-43124: Fix smtplib multiple CRLF injection (GH-25987) (GH-28037)
- bpo-42278: Use tempfile.TemporaryDirectory rather than tempfile.mktemp in pydoc (GH-23200) (GH-28026)
In both cases, CPython patches applied cleanly against py3.7 branch.
I've got also a work-in-progress patches for Python 2.7 but it's gotten really late and I need to fix tests tomorrow.