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/

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