Add missing desugaring

experimental/build.gradle.kts

@@ -22,6 +22,7 @@ android {
     }
 
     compileOptions {
+        isCoreLibraryDesugaringEnabled = true
         sourceCompatibility = JavaVersion.VERSION_17
         targetCompatibility = JavaVersion.VERSION_17
     }
@@ -39,6 +40,8 @@ android {
 }
 
 dependencies {
+    coreLibraryDesugaring(libs.desugar)
+
     implementation(project(":androidshared"))
     implementation(project(":strings"))