godot_4-mono : dotnet-sdk_6 is EOL (marked insecure)

[Arsalan2356]

Issue description

godot_4-mono uses dotnet-sdk_6 which is EOL and marked as insecure. I've tried fixing it locally, but I'm not sure how to go about it.
Currently using this package requires allowing dotnet-sdk_6 via permittedInsecurePackages.

Would appreciate any help from someone more experienced with dotnet.

[corngood]

Upstream has done the upgrade to net8.0 in godotengine/godot@fb8553e.

It looks quite complicated to backport, so we could either wait for an upstream release, or potentially add a bleeding edge derivation?