Update snapcraft recipe

snapcraft.yaml

@@ -22,7 +22,7 @@
 
 name: appstream-generator
 license: LGPL-3.0
-base: core20
+base: core22
 adopt-info: appstream-generator
 
 confinement: strict
@@ -166,7 +166,7 @@ parts:
   appstream:
     source: https://github.com/ximion/appstream.git
     source-type: git
-    source-tag: v0.15.2
+    source-tag: v0.16.0
 
     plugin: meson
     meson-parameters:
@@ -174,6 +174,7 @@ parts:
       - --buildtype=debugoptimized
       - -Dcompose=true
       - -Dapidocs=false
+      - -Dsystemd=false
     build-packages:
       - build-essential
       - docbook-xsl
@@ -233,7 +234,7 @@ parts:
 
   ldc:
     plugin: dump
-    source: https://github.com/ldc-developers/ldc/releases/download/v1.28.0/ldc2-1.28.0-linux-x86_64.tar.xz
+    source: https://github.com/ldc-developers/ldc/releases/download/v1.30.0/ldc2-1.30.0-linux-x86_64.tar.xz
 
     override-build: |
       # link shared by default