poky: Update to prepare for scarthgap release

(From meta-yocto rev: 4e53cc57c1e6c05098f3cfd467bd9cdbc86bd363)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/distro/poky.conf

@@ -1,7 +1,7 @@
 DISTRO = "poky"
 DISTRO_NAME = "Poky (Yocto Project Reference Distro)"
 DISTRO_VERSION = "4.3+snapshot-${METADATA_REVISION}"
-DISTRO_CODENAME = "nanbield"
+DISTRO_CODENAME = "scarthgap"
 SDK_VENDOR = "-pokysdk"
 SDK_VERSION = "${@d.getVar('DISTRO_VERSION').replace('snapshot-${METADATA_REVISION}', 'snapshot')}"
 SDK_VERSION[vardepvalue] = "${SDK_VERSION}"
@@ -33,13 +33,13 @@ TCLIBCAPPEND = ""
 PACKAGE_CLASSES ?= "package_rpm"
 
 SANITY_TESTED_DISTROS ?= " \
-            poky-4.2 \n \
             poky-4.3 \n \
-            ubuntu-18.04 \n \
+            poky-5.0 \n \
             ubuntu-20.04 \n \
             ubuntu-22.04 \n \
             ubuntu-23.04 \n \
             fedora-38 \n \
+            fedora-39 \n \
             centosstream-8 \n \
             debian-11 \n \
             debian-12 \n \