fix(core): add proguard rule to keep JSON deserializers (#10800)

.changes/proguard-keep-json-deserializer-classes.md

@@ -0,0 +1,5 @@
+---
+"tauri": patch:bug
+---
+
+Change the Android Proguard rules to keep custom JSON deserializers.

core/tauri/mobile/android/proguard-rules.pro

@@ -27,3 +27,5 @@
 -keep @app.tauri.annotation.InvokeArg public class * {
   *;
 }
+
+-keep class * extends com.fasterxml.jackson.databind.JsonDeserializer { *; }