bump version

Author: wengxt

data/org.fcitx.Fcitx5.metainfo.xml.in

@@ -31,6 +31,7 @@
     <binary>fcitx5</binary>
   </provides>
   <releases>
+    <release version="5.1.15" date="2025-10-25"/>
     <release version="5.1.14" date="2025-06-19"/>
     <release version="5.1.13" date="2025-06-15"/>
     <release version="5.1.12" date="2025-01-22"/>