Add .NET SDK 5.0.404 and bump nuget2bazel NuGet dependencies to 5.11.0

[ghost]

rules_dotnet currently uses .NET SDK 5.0.201 which is affected by NuGet/Home#10491. This makes the rules unusable on Mac OSX.

When using the nuget2bazel tool, errors like the following appear:

Unhandled exception. NuGet.Packaging.Signing.SignatureException: Signed package validation failed with multiple errors:
NU3037: Package 'System.Buffers 4.5.1' from source 'https://api.nuget.org/v3/index.json': The author primary signature validity period has expired.
NU3037: Package 'System.Buffers 4.5.1' from source 'https://api.nuget.org/v3/index.json': The repository countersignature validity period has expired.

This change set bumps the default .NET SDK to 5.0.404 and upgrades the nuget2bazel NuGet dependencies for fetching packages to 5.11.0, which resolves the above issue.

[purkhusid]

Looks good to me! Thanks for the contribution!