Bump versionCode. (#6109)

Author: Williamrai

app/build.gradle

@@ -40,7 +40,7 @@ android {
         applicationId 'org.wikipedia'
         minSdk = 23
         targetSdk = 36
-        versionCode 50556
+        versionCode 50557
         testApplicationId 'org.wikipedia.test'
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         testInstrumentationRunnerArguments clearPackageData: 'true'