doc/conf: avoid name conflict for version

We should not import importlib.metadata.version as `version` because it
clashes with sphinx config.version.

import metadata and use metadata.version() for clarity.

Signed-off-by: Jonas Rebmann <jre@pengutronix.de>

Author: jonrebm

doc/conf.py

@@ -21,7 +21,7 @@
 import sys
 sys.path.insert(0, os.path.abspath('..'))
 
-from importlib.metadata import version
+from importlib import metadata
 
 # Import read_the_docs theme
 import sphinx_rtd_theme
@@ -65,7 +65,7 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-release = version('labgrid')
+release = metadata.version('labgrid')
 # The short X.Y version.
 version = '.'.join(release.split('.')[:2])