[release]: Update Flatpak manifest

Author: mr-cheffy

app.zen_browser.zen.metainfo.xml

@@ -59,7 +59,7 @@
     <control>keyboard</control>
   </supports>
   <releases>
-    <release version="1.17.6b" date="2025-11-07T17:53:32.873Z">
+    <release version="1.17.6b" date="2025-11-08T18:34:24.827Z">
       <url type="details">https://zen-browser.app/release-notes/1.17.6b</url>
     </release>
     <release version="1.17.5b" date="2025-11-05T10:07:46.876Z">