feat: [OSM-894] Add test support for .NET 8

[dotkas]

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What does this PR do?

Adds test capabilities to ensure that snyk test --dotnet-runtime-resolution works for .NET projects targeting version 8 (new LTS).

Where should the reviewer start?

The circleci config files and Dockerfile.

How should this be manually tested?

/bin/snyk test --dotnet-runtime-resolution with the dotnet SDK version 8 installed on your machine.

Any background context you want to provide?

All of the actual support is nested in the snyk-nuget-plugin, this just ensures that we can test .NET 8 projects in the acceptance tests.

What are the relevant tickets?

https://snyksec.atlassian.net/browse/OSM-894

Risk

Low. It's already tested and working in the plugin: https://github.com/snyk/snyk-nuget-plugin/blob/ae06ef40098d9281aec2317fb9b50199d8c89f36/test/parsers/parse-core-v2.spec.ts#L39-L41

[dotkas]

By default the windows executor uses the 7.0 SDK, so need to force an update.

[dotkas]

CircleCI said they update them once every 6 months or something.

[bastiandoetsch]

Please sign all commits :)