Merge pull request #206 from scipp/fix-namespace-version

fix: rewrite string to match package name

template/src/{% if namespace_package %}{{namespace_package}}{% endif %}/{{ projectname.removeprefix(namespace_package) }}/__init__.py.jinja

@@ -5,7 +5,7 @@
 import importlib.metadata
 
 try:
-    __version__ = importlib.metadata.version(__package__ or __name__)
+    __version__ = importlib.metadata.version("{{projectname}}")
 except importlib.metadata.PackageNotFoundError:
     __version__ = "0.0.0"