chore: bump version to 0.2.1 (first release with cs_util.size)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: cailmdaley

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "cs_util"
-version = "0.2"
+version = "0.2.1"
 description = "Utility library for CosmoStat"
 authors = [
 	{ name = "Martin Kilbinger", email = "martin.kilbinger@cea.fr" },