Update copyright year in version output for gdb, gdbserver and gdbreplay

Update copyright year in version output for gdb, gdbserver and gdbreplay

This commit changes the end year of the copyright year range
printed by gdb, gdbserver and gdbreplay to be 2022. This reflects
the fact that some changes were made on this branch this year.

gdb/ChangeLog:

        * top.c: Update year range in copyright notice.
        (print_gdb_version): Update copyright year to 2022.

gdbserver/ChangeLog:

       * gdbreplay.cc: Update year range in copyright notice.
       (gdbreplay_version): Update copyright year to 2022.
       * server.cc: Update year range in copyright notice.
       (gdbserver_version): Update copyright year to 2022.