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It is an Operating System Requirement Update, this morning Opera Staff just Discontinued all updates to the OSes of Windows 7, 8 & 8.1 entirely, that is what that update mentions, and there is no way of getting rid of it, Opera's Staff may require you not to use this browser when this message happen, some people could not use it earlier when they had to deal with this "Get latest security update" message.
Well also we have to contend that Microsoft is also pushing people to Windows 11, I know Opera already is looking to Develop hard into Windows 11 and soon to be Windows 12,
https://www.microsoft.com/insidetrack/blog/unpacking-microsofts-speedy-upgrade-to-windows-11/
And by the time many get off of Windows 7, they will have to upgrade again shortly after 10, and it will forced on.