Fix build break

Author: AArnott

src/Cake.GitVersioning.Tests/Cake.GitVersioning.Tests.csproj

@@ -16,6 +16,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+    <PackageReference Include="Nerdbank.GitVersioning.LKG" Version="3.4.173-alpha" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>