[PATCH htdocs] schedule: fix GDB 13 date typos

[Tom Tromey]

>>>>> "Mike" == Mike Frysinger <vapier@gentoo.org> writes:

Mike> -<th>Branch:</th><td>Oct 2023 (2022-10-08)</td><td>Apr 2024</td>
Mike> +<th>Branch:</th><td>Oct 2023 (2023-10-08)</td><td>Apr 2024</td>

This one seems obvious.
Approved-By: Tom Tromey <tom@tromey.com>

Tom