Add setuptools-scm for dynamic version for scm version management

pyproject.toml

@@ -1,10 +1,10 @@
 [build-system]
-requires = ["setuptools>=42", "wheel"]
+requires = ["setuptools>=42", "wheel", "setuptools_scm>=8"]
 build-backend = "setuptools.build_meta"
 
 [project]
 name = "django-constance"
-version = "4.1.0"
+dynamic = ["version"]
 description = "Django live settings with pluggable backends, including Redis."
 readme = "README.rst"
 license = { text = "BSD" }
@@ -52,6 +52,9 @@ changelog = "https://github.com/jazzband/django-constance/releases/"
 [tool.setuptools.packages.find]
 include = ["constance*"]
 
+[tool.setuptools_scm]
+version_file = "constance/_version.py"
+
 [tool.ruff]
 line-length = 120
 indent-width = 4