devel/py-fastbencode: Update 0.2 => 0.3.2, undeprecate

This fixes build with current cython versions. While not the current
upstream release, newer versions rework the build significantly, so this
is done as an intermediate step forward.

Changelogs:
https://github.com/breezy-team/fastbencode/releases/tag/v0.3.0
https://github.com/breezy-team/fastbencode/releases/tag/v0.3.1
https://github.com/breezy-team/fastbencode/releases/tag/v0.3.2

PR: 298550
Sponsored by: UNIS Labs (vvd, commit patch)