Fix version number in built docs

Author: dstansby

docs/conf.py

@@ -16,11 +16,8 @@
 import os
 import sys
 
-# The version info for the project you're documenting, acts as replacement for
-# |version| and |release|, also used in various other places throughout the
-# built documents.
-#
-# The short X.Y version.
+from importlib.metadata import version as get_version
+
 import zarr
 
 # If extensions (or modules to document with autodoc) are in another directory,
@@ -75,9 +72,8 @@
 copyright = "2024, Zarr Developers"
 author = "Zarr Developers"
 
-version = zarr.__version__
-# The full version, including alpha/beta/rc tags.
-release = zarr.__version__
+version = get_version("package-name")
+release = get_version("package-name")
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.