chore: Bump release to 0.4.0

Author: hpohekar

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "flit_core.buildapi"
 [project]
 # Check https://flit.readthedocs.io/en/latest/pyproject_toml.html for all available sections
 name = "ansys-units"
-version = "0.4.dev0"
+version = "0.4.0"
 description = "Pythonic interface for units, unit systems, and unit conversions."
 readme = "README.rst"
 requires-python = ">=3.9,<4"