manibuilder/anita: Update to NetBSD 9.3

Container images need to be rebuilt for Meson support anyway.

Change-Id: I4f1a034fac6e2e43c6572bf59f98548e39273801
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/73406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
2 files changed