chore(appstream): add 2.1.10 release metadata

* Update release info to include version `2.1.10` dated 2025-10-25
* Keeps appstream and metainfo files in sync with latest release

Author: saturneric

resource/appstream/com.bktus.gpgfrontend.appdata.xml

@@ -91,6 +91,7 @@
   </keywords>
 
   <releases>
+    <release version="2.1.10" date="2025-10-25"/>
     <release version="2.1.9" date="2025-06-18"/>
     <release version="2.1.8" date="2025-04-19"/>
     <release version="2.1.7" date="2025-02-04"/>

resource/appstream/com.bktus.gpgfrontend.metainfo.xml

@@ -84,6 +84,7 @@
   <url type="vcs-browser">https://github.com/saturneric/GpgFrontend</url>
 
   <releases>
+    <release version="2.1.10" date="2025-10-25"/>
     <release version="2.1.9" date="2025-06-18"/>
     <release version="2.1.8" date="2025-04-19"/>
     <release version="2.1.7" date="2025-02-04"/>