gdb: update some copyright years (2022 -> 2023)

gdb: update some copyright years (2022 -> 2023)

The copyright years in the ROCm files (e.g. solib-rocm.c) are wrong,
they end in 2022 instead of 2023.  I suppose because I posted (or at
least prepared) the patches in 2022 but merged them in 2023, and forgot
to update the year.  I found a bunch of other files that are in the same
situation.  Fix them all up.

Change-Id: Ia55f5b563606c2ba6a89046f22bc0bf1c0ff2e10
Reviewed-By: Tom Tromey <tom@tromey.com>