build(deps): bump pyarrow to 25.0.1 for timestamp materialisation

pyproject.toml

@@ -34,6 +34,11 @@ dependencies = [
     # docs/cascade_runbook.md. Never widen this floor back below 0.34 (older lance
     # cannot read v8 data).
     "lancedb>=0.34.0,<0.35.0",    # Vector + BM25 + scalar filter (Arrow-based)
+    # Floor, not a new package: lancedb pulls pyarrow in anyway. 25.0.1 stops
+    # the per-value `import pytz` attempt in to_pylist() (24 walked sys.path
+    # for every tz-aware timestamp) and materialises rows without a Scalar
+    # per element; 25.0.0 lacks the latter and has a mimalloc exit crash.
+    "pyarrow>=25.0.1",
     "aiosqlite>=0.20.0",          # Async SQLite driver (used by SA async engine)
     "sqlmodel>=0.0.22",           # ORM (Pydantic + SQLAlchemy 2.0 async)
     "alembic>=1.13.0",            # SQLite schema migrations