Updating to newer version of NuGetUtils.MSBuild.Exec in order to cut down the amount of process invocations used by the task factory.

Author: stazz

src/GitVersionTask/NuGetUtils.MSBuild.Exec.Version.props

@@ -1,5 +1,5 @@
 <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <PackageVersion_NuGetUtilsMSBuildExec>2.0.3</PackageVersion_NuGetUtilsMSBuildExec>
+    <PackageVersion_NuGetUtilsMSBuildExec>2.0.4</PackageVersion_NuGetUtilsMSBuildExec>
   </PropertyGroup>
 </Project>