libreoffice: Update version from 6.1.4.2 to 6.1.5.2

The announcement is available [online][1].

> The Document Foundation has also released LibreOffice 6.1.5, a more
> mature version which includes some months of back-ported fixes and is
> better suited for enterprise class deployments, where features are less
> important than robustness as the main objective is individual
> productivity.

Let’s wait a little bit until updating to LibreOffice 6.2.

[1]: https://blog.documentfoundation.org/blog/2019/02/07/libreoffice-6-2/

libreoffice.be0

@@ -1,6 +1,6 @@
 #!/usr/bin/env beesh
 
-# BEE_VERSION libreoffice-6.1.4.2-0
+# BEE_VERSION libreoffice-6.1.5.2-0
 
 ## this file was created by bee init and should be executed to build a
 ## bee-package. (Additional hints are located at the end of this file.)