Bump version to 0.8.1

Includes fix for NaN in band statistics JSON serialization.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: jatorre

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "raquet-io"
-version = "0.8.0"
+version = "0.8.1"
 description = "RaQuet - Raster data in Parquet format with QUADBIN spatial indexing"
 readme = "README.md"
 license = {text = "BSD-3-Clause"}