Release v2.7.3 version increase

Note: v2.7.2 was skipped due to publishing issue, see 7007b87

Author: wslany

build.gradle

@@ -1,6 +1,6 @@
 /**
  *  Paintroid: An image manipulation application for Android.
- *  Copyright (C) 2010-2015 The Catrobat Team
+ *  Copyright (C) 2010-2021 The Catrobat Team
  *  (<http://developer.catrobat.org/credits>)
  *
  *  This program is free software: you can redistribute it and/or modify
@@ -44,8 +44,8 @@ ext {
 
     androidSupportLibraryVersion = '28.0.0'
 
-    androidVersionCode = 38
-    androidVersionName = '2.7.1'
+    androidVersionCode = 40
+    androidVersionName = '2.7.3'
 }
 
 if(project.hasProperty("snapshot")) {