seabios: update to 1.13.0 final

Update to the final 1.13 release.  No code changes.

git shortlog
============

Kevin O'Connor (1):
      docs: Note v1.13.0 release

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

roms/config.seabios-128k

@@ -15,3 +15,4 @@ CONFIG_PVSCSI=n
 CONFIG_NVME=n
 CONFIG_USE_SMM=n
 CONFIG_VGAHOOKS=n
+CONFIG_HOST_BIOS_GEOMETRY=n

roms/seabios

@@ -1 +1 @@
-Subproject commit c9ba5276e3217ac6a1ec772dbebf568ba3a8a55d
+Subproject commit f21b5a4aeb020f2a5e2c6503f906a9349dd2f069