Additional configuration for setuptools.scm (#85)

Out of the box, setuptools_scm generates development
package versions in a format that doesn't comply with
PEP 440, so the test-pypi publish workflow failed.

That's by design, to prevent dev releases going to PyPI.
However, our prod PyPI workflow will trigger only when
a tag in the format v[0-9].[0-9].[0-9] is pushed to
GitHub, so the liklihood of inadvertently publishing
a dev version to PyPI is low.

pyproject.toml

@@ -85,6 +85,7 @@ namespaces = true
 where = ["src"]
 
 [tool.setuptools_scm]
+local_scheme = "no-local-version"
 
 [tool.pytest.ini_options]
 tmp_path_retention_policy = "none"
@@ -106,4 +107,5 @@ lint.extend-select = ["I"]
 "__init__.py" = ["I001"]
 
 [tool.mypy]
-ignore_missing_imports = true
+ignore_missing_imports = false
+