Bump NuGet.Protocol from 6.11.1 to 6.12.1

Bumps [NuGet.Protocol](https://github.com/NuGet/NuGet.Client) from 6.11.1 to 6.12.1.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.Protocol
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/LibYear.Core/LibYear.Core.csproj

@@ -19,7 +19,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="all" />
-		<PackageReference Include="NuGet.Protocol" Version="6.11.1" />
+		<PackageReference Include="NuGet.Protocol" Version="6.12.1" />
 		<None Include="../../README.md" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="." />
 		<PackageReference Include="System.IO.Abstractions" Version="21.1.3" />
 	</ItemGroup>

test/LibYear.Core.Tests/LibYear.Core.Tests.csproj

@@ -8,7 +8,7 @@
 		<PackageReference Include="coverlet.collector" Version="6.0.2" />
 		<PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
 		<PackageReference Include="NSubstitute" Version="5.3.0" />
-		<PackageReference Include="NuGet.Protocol" Version="6.11.1" />
+		<PackageReference Include="NuGet.Protocol" Version="6.12.1" />
 		<PackageReference Include="System.IO.Abstractions" Version="21.1.3" />
 		<PackageReference Include="xunit" Version="2.9.2" />
 		<PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />