[release]: Update Flatpak manifest

Author: mr-cheffy

app.zen_browser.zen.metainfo.xml

@@ -59,7 +59,7 @@
     <control>keyboard</control>
   </supports>
   <releases>
-    <release version="1.18.5b" date="2026-02-06T10:57:20.379Z">
+    <release version="1.18.5b" date="2026-02-06T21:43:56.713Z">
       <url type="details">https://zen-browser.app/release-notes/1.18.5b</url>
     </release>
     <release version="1.18.4b" date="2026-02-04T10:20:44.757Z">