chore: update sparkle version to 2.7

Author: itsjoshpark

.sparkle/appcast.xml

@@ -4,6 +4,23 @@
     <title>Front Row</title>
     <language>en</language>
 
+    <item>
+      <title>v2.7</title>
+      <link>https://github.com/itsjoshpark/FrontRow</link>
+      <sparkle:version>2.7</sparkle:version>
+      <sparkle:minimumSystemVersion>15.6</sparkle:minimumSystemVersion>
+      <sparkle:fullReleaseNotesLink>https://github.com/itsjoshpark/FrontRow/releases</sparkle:fullReleaseNotesLink>
+      <pubDate>Sun, 11 Jan 2025 05:20:25 +0000</pubDate>
+      <description><![CDATA[
+      <ul>
+      <li>New: Display filename in title bar</li>
+      </ul>
+      <p>This version includes one-time changes and cannot be installed using the auto updater.</p>
+      <p>Click <strong>“More Info”</strong> to visit our website and download the update.</p>
+      ]]>
+      </description>
+    </item>
+
     <item>
       <title>v2.6</title>
       <link>https://github.com/itsjoshpark/FrontRow</link>