Add GitVersion.Tool to build dependencies

Author: manandre

.build/.build.csproj

@@ -22,4 +22,8 @@
         <None Remove="*.csproj.DotSettings;*.ref.*.txt" />
     </ItemGroup>
 
+    <ItemGroup>
+      <PackageDownload Include="GitVersion.Tool" Version="[5.12.0]" />
+    </ItemGroup>
+
 </Project>