Update copyright year from 2022 to 2012-2024 (#1046)

Author: TobiGr

docs/conf.py

@@ -66,7 +66,7 @@
 
 # General information about the project.
 project = 'Isso'
-copyright = '2022, Martin Zimmermann & contributors'
+copyright = '2012-2024, Martin Zimmermann & contributors'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.