Update copyright notice

src/frontend/misccoms.c

@@ -185,7 +185,7 @@ com_version(wordlist *wl)
                 "** %s-%s : %s\n"
                 "** The U. C. Berkeley CAD Group\n"
                 "** Copyright 1985-1994, Regents of the University of California.\n"
-                "** Copyright 2001-2022, The ngspice team.\n"
+                "** Copyright 2001-2023, The ngspice team.\n"
                 "** %s\n",
                 ft_sim->simulator, ft_sim->version, ft_sim->description, Spice_Manual);
         if (*Spice_Notice != '\0')
@@ -222,7 +222,7 @@ com_version(wordlist *wl)
                     "** %s-%s : %s\n"
                     "** The U. C. Berkeley CAD Group\n"
                     "** Copyright 1985-1994, Regents of the University of California.\n"
-                    "** Copyright 2001-2022, The ngspice team.\n"
+                    "** Copyright 2001-2023, The ngspice team.\n"
                     "** %s\n",
                     ft_sim->simulator, ft_sim->version, ft_sim->description, Spice_Manual);
             if (*Spice_Notice != '\0')