fix: Upgrade minSdk of the demo app to 23

Author: sotomski

app/build.gradle.kts

@@ -28,7 +28,7 @@ android {
     defaultConfig {
         applicationId = "org.maplibre.navigation.android.example"
         compileSdk = 35
-        minSdk = 21
+        minSdk = 23
 
         versionCode = 1
         versionName = project.properties.get("versionName") as String? ?: "0.0.0"