style(ruff): use collections.abc Mapping in provenance module

Why:
- CI Ruff step flagged UP035 for typing imports.

What changed:
- Switched Mapping import from typing to collections.abc.
- Kept Any imported from typing.

Expected impact:
- Eliminates Ruff error with no behavioral change.

Author: jbenjoseph

src/refua_data/provenance.py

@@ -2,8 +2,9 @@
 
 from __future__ import annotations
 
+from collections.abc import Mapping
 from pathlib import Path
-from typing import Any, Mapping
+from typing import Any
 
 
 def load_materialized_manifest(manifest_path: Path) -> dict[str, Any]: