gdbsupport: fix Makefile.in copyright dates
Commit d01e823438 ("Update copyright dates to include 2025") incorrectly
changed the dates in Makefile.in. Re-run `autoreconf` in the gdbsupport
directory to fix that up.
Change-Id: Ifcdb6f2257e7a456439dfc3e7848db934a4b16b4