editors/libreoffice: update to 7.6.2 release (+)

Please welcome LibreOffice Suite 7.6.2 Community release!

* Document themes
* Navigation panel in Impress
* Highlighting for used styles
...plus compatibility, performance and accessibility improvements.

Release Notes:	https://blog.documentfoundation.org/blog/2023/08/21/libreoffice-7-6-community/
		https://blog.documentfoundation.org/blog/2023/09/14/libreoffice-7-6-1/
		https://blog.documentfoundation.org/blog/2023/09/26/lo-762-and-lo-757/

Sponsored by:	Serenety Cybersecurity LLC