It isn't appropriate for the PSF to ask a single community
volunteer to accept full responsibility for the PSF's
policy on PyPI name management.
Delegating the task to the Packaging Working Group is more
appropriate, since we're already responsible for handling
the PSF's budget in this area, and there's a lot of overlap
between budget management and risk management.
This updates the BDFL-Delegate to be Mark Mangoba (as
the PSF's IT manager), and changes the delegate's role
for this PEP as being to put the policy forward for a vote
in the working group.