Migrate to setuptools_scm>=8.0 for dynamic __version__

pyproject.toml

@@ -1,11 +1,13 @@
 [build-system]
 requires = [
     "setuptools >= 64.0",
-    "setuptools_scm[toml]>=6.2",
+    "setuptools_scm[toml]>=8.0",
     "wheel",
     "setuptools-rust",
 ]
 
+[tool.setuptools_scm]
+
 [tool.isort]
 # https://pycqa.github.io/isort/docs/configuration/options.html
 profile = "google"

setup.py

@@ -57,17 +57,10 @@ def read_readme():
   import setuptools_scm
 except ImportError as ex:
   raise ImportError("setuptools_scm not found. When running setup.py directly, "
-                    "setuptools_scm needs to be installed manually. "
+                    "setuptools_scm>=8.0 needs to be installed manually. "
                     "Or consider running `pip install -e .` instead.") from ex
 
 
-def read_version():
-  return setuptools_scm.get_version()
-
-
-__version__ = read_version()
-
-
 # brought from https://github.com/kennethreitz/setup.py
 class DeployCommand(Command):
   description = 'Build and deploy the package to PyPI.'
@@ -158,7 +151,7 @@ def next_semver(version: setuptools_scm.version.ScmVersion):
 
 setup(
     name='expt',
-    version=__version__,
+    # version=__version__,  # setuptools_scm sets version automatically
     use_scm_version=dict(
         write_to='expt/_version.py',
         version_scheme=next_semver,