fix(manager/nuget): Enforce basic authentication for NuGet restore command

[sbaeurle]

Changes

This PR changes the ValidAuthenticationTypes for the dotnet restore command issued to update an package.lock.json files found in the repository.

Context

Some artifact feed support multiple authentication types (e.g. NTLM for Azure DevOps Server) which are not supported by the configured authentication scheme.
Since the current implementation of the NuGet dependency lookup only supports basic authentication, it is sensible to enforce basic authentication for the dotnet restore command as well.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[viceice]

this needs tests against real repos, you can use GitHub packages for testing.

[sbaeurle]

I verified the following use cases:

• Update of package-lock.json files in our local Azure DevOps instance (works as expected)
• Update of package-lock.json file for dummy project on GitHub using a private "NewtonSoft.Json" clone hosted in Github packages (see https://github.com/sbaeurle/nuget-manager-fix-test/pull/2 for the resulting PR)

[renovate-release]

🎉 This PR is included in version 37.37.2 🎉

The release is available on:

• GitHub release
• 37.37.2

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