Update copyright year

Leaving it as 2014 makes it appear (from the docs) that the project is stale. Updating it to avoid putting people off if they don't click through to the repo

doc/source/conf.py

@@ -47,7 +47,7 @@
 
 # General information about the project.
 project = u'requests-mock'
-copyright = u'2014, Jamie Lennox'
+copyright = u'2023, Jamie Lennox'
 
 # The version info for the project you're documenting, acts as replacement for
 # |version| and |release|, also used in various other places throughout the