RelBench 3.0.1

Patch release on top of 3.0.0.

• python -m relbench.submit no longer crashes on Windows consoles that cannot print
  the report's check-mark glyphs (ASCII fallback).
• Autocomplete train splits start a whole timedelta before the earliest row, so the
  first rows are included on every duckdb version.
• The trivial example scripts no longer import torch; CI runs one of them and the
  quickstart notebook on every push.
• provenance/check_provenance.py checks several datasets in one run, skips external and
  autocomplete tasks, and fails loudly on drift.
• Hosted labels regenerated where the provenance check found drift (rel-event/user-repeat,
  rel-stack/post-votes, rel-stack/user-post-comment); see the 3.0.0 notes below.