Update to 2023.12

Signed-off-by: Stefano Babic <stefano.babic@swupdate.org>

recipes-support/swupdate/swupdate_2023.12.bb

@@ -0,0 +1,3 @@
+require swupdate.inc
+
+SRCREV = "2042e6dc0f5466bd428f4db18eaff638203150ad"

recipes-support/swupdate/swupdate_git.bb

@@ -2,5 +2,5 @@ require swupdate.inc
 
 DEFAULT_PREFERENCE = "-1"
 
-SRCREV ?= "954e8c0b0f24fdd8f17ae7d382ff96622b95111a"
-PV = "2023.05+git${SRCPV}"
+SRCREV ?= "2042e6dc0f5466bd428f4db18eaff638203150ad"
+PV = "2023.12+git${SRCPV}"