doc: conf: update the documentation copyright year

Update the copyright year listed in the generated documentation.

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

doc/conf.py

@@ -8,7 +8,7 @@
 import sys
 
 project = 'CANnectivity'
-copyright = '2024, The CANnectivity Developers'
+copyright = '2024-2025, The CANnectivity Developers'
 author = 'The CANnectivity Developers'
 
 extensions = [