Update snapcraft.yaml

relates typora/typora-issues#6281

Author: abnerlee

snap/snapcraft.yaml

@@ -12,7 +12,7 @@ description: |
   source resources for user customization of themes.
 
 adopt-info: typora
-base: core20
+base: core22
 grade: stable
 confinement: strict
 architectures: 
@@ -86,7 +86,7 @@ parts:
   cleanup:
     after: [typora, wrapper]
     plugin: nil
-    build-snaps: [core20, gnome-3-38-2004]
+    build-snaps: [core22, gnome-42-2204]
     override-prime: |
       find $SNAPCRAFT_PRIME/usr/share/doc/ -type f -not -name 'copyright' -delete
       find $SNAPCRAFT_PRIME/usr/share/man/ -type f -delete