Upgrade to dotnet 6

[magnuskarlssonhm]

GoogleShopping plugin should be upgraded to dotnet 6 to support Grandnode latest version.
Would you accept some help with this @KrzysztofPajak ? I know @tobylo is eager to help out with this task.

[KrzysztofPajak]

@magnuskarlssonhm
I can share sources to Grandnode 2 version 1.0 - it would be easier upgrade it to version 2.0

[tobylo]

@KrzysztofPajak
share sourcecode of what? The grandnode 2 source is here on GitHub.

I've started looking at upgrading it to work with v2.