release: update appcast for v1.2.0

Author: JerryZLiu

docs/appcast.xml

@@ -3,6 +3,18 @@
   <channel>
     <title>Dayflow Updates</title>
     <language>en</language>
+    <item>
+      <title>Version 1.2.0</title>
+      <pubDate>Fri, 14 Nov 2025 05:37:08 +0000</pubDate>
+      <enclosure url="https://github.com/JerryZLiu/Dayflow/releases/download/v1.2.0/Dayflow.dmg"
+                 sparkle:version="62"
+                 sparkle:shortVersionString="1.2.0"
+                 length="28415533"
+                 type="application/octet-stream"
+                 sparkle:edSignature="Bhs/ttueq3oBGfpWil/YVl+lnVBAXqQ8bjJw95kF9QaSk6BYIKPcUjjduz40PB2DGW49BvxJ0pq/XFxIiOzPAA=="/>
+      <sparkle:minimumSystemVersion>13.0</sparkle:minimumSystemVersion>
+      <releaseNotesLink>https://github.com/JerryZLiu/Dayflow/releases/tag/v1.2.0</releaseNotesLink>
+    </item>
     <item>
       <title>Version 1.1.21</title>
       <pubDate>Thu, 13 Nov 2025 06:20:07 +0000</pubDate>