Bump version to v0.12.3

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AmitMY

src/python/pyproject.toml

@@ -1,7 +1,7 @@
 [project]
 name = "pose_format"
 description = "Library for viewing, augmenting, and handling .pose files"
-version = "v0.12.2"
+version = "v0.12.3"
 keywords = ["Pose Files", "Pose Interpolation", "Pose Augmentation"]
 readme = "README.md"
 authors = [