automated versioning (#175)

Co-authored-by: mazzol_a <mazzol_a@pc17378.psi.ch>
Co-authored-by: Erik Fröjdh <erik.frojdh@psi.ch>

pyproject.toml

@@ -1,10 +1,16 @@
+[tool.scikit-build.metadata.version]
+provider = "scikit_build_core.metadata.regex"
+input = "VERSION"
+regex = '^(?P<version>\d+(?:\.\d+)*(?:[\.\+\w]+)?)$'
+result = "{version}" 
+
 [build-system]
 requires = ["scikit-build-core>=0.10", "pybind11", "numpy"]
 build-backend = "scikit_build_core.build"
 
 [project]
 name = "aare"
-version = "2025.4.22"
+dynamic = ["version"]
 requires-python = ">=3.11"
 dependencies = [
     "numpy",