increase project version to 4.3.1

Author: lonvia

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "osmium"
-version = "4.3.0"
+version = "4.3.1"
 description = "Python bindings for libosmium, the data processing library for OSM data"
 requires-python = ">=3.8"
 readme = "README.rst"