Bump Android build ID for upload to Google Play

android/vcmi-app/build.gradle

@@ -10,7 +10,7 @@ android {
 		applicationId "is.xyz.vcmi"
 		minSdk 19
 		targetSdk 33
-		versionCode 1520
+		versionCode 1521
 		versionName "1.5.2"
 		setProperty("archivesBaseName", "vcmi")
 	}