poky.conf: add ubuntu2404 to SANITY_TESTED_DISTROS

(From meta-yocto rev: af63d6abd596da87881485fcfcfb21e6847f1801)

Signed-off-by: Steve Sakoman <steve@sakoman.com>

meta-poky/conf/distro/poky.conf

@@ -37,6 +37,7 @@ SANITY_TESTED_DISTROS ?= " \
             ubuntu-18.04 \n \
             ubuntu-20.04 \n \
             ubuntu-22.04 \n \
+            ubuntu-24.04 \n \
             fedora-37 \n \
             fedora-39 \n \
             fedora-40 \n \