[android] Fix update checker crash on release mode (#3909)

R8 minifies the UpdateResult's data class to remove the `Set...`
methods, as it's technically not used in Kotlin/Java land.

Just force the minifier to keep it

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3909

src/android/app/build.gradle.kts

@@ -88,7 +88,6 @@ android {
                         "-DBUILD_TESTING=OFF",
                         "-DYUZU_TESTS=OFF",
                         "-DDYNARMIC_TESTS=OFF",
-                        "-DENABLE_UPDATE_CHECKER=ON",
                         *extraCMakeArgs.toTypedArray()
                     )
                 )

src/android/app/src/main/java/org/yuzu/yuzu_emu/NativeLibrary.kt

@@ -33,6 +33,7 @@ import org.yuzu.yuzu_emu.applets.web.WebBrowser
  * with the native side of the Yuzu code.
  */
 object NativeLibrary {
+    @Keep
     data class UpdateResult(
         var tag: String = "",
         var title: String = "",