Build and upload Python 3.13 wheels

[justin-omalley]

Description

Adds Python 3.13.12 to the build_wheel matrix alongside 3.12.11, so we start publishing a cp313 libpff_python wheel. This is a prerequisite for upgrading servers to Python 3.13.

Also bumps the pinned libcfile tag to 20260704: upstream deleted the previously pinned 20260615 tag, which was breaking the build for any push.

Jira, Podio Bug or Trello Card Link:

https://everlaw.atlassian.net/browse/PE-791

Testing Procedure or Link:

• build_wheel workflow runs on this branch and both matrix jobs (3.12.11 and 3.13.12) pass, including tests/runtests.py and the mypy stubs check
• libpff_python-20240608.4-cp313-cp313-linux_x86_64.whl (and .sig) appear in s3://everlaw-artifacts/libpff/
• The 3.12 job reports "already exists" for the current cp312 and pypff_stubs wheels and does not fail

Link to SIA (N/A if None):

N/A

[kmurphy4]

Why 3.13.12? Seems like 3.13.14 has been released :)

https://www.python.org/downloads/release/python-31314/

[justin-omalley]

I guess this is the latest version our pinned uv version can install? But maybe I should just bump uv itself? Looks like we could use the latest Python 3.13 release if we upgrade to uv 0.11.21 or newer.

[justin-omalley]

Just opened https://github.com/Everlaw/servers/pull/54383, which bumps the uv version (and starts to manage it via Renovate, though that part can be reverted if there's a reason we currently manage it manually). Once that's landed, I can update these PRs to point at the latest Python 3.13.