Bump ReportGenerator from 4.5.2 to 4.6.4 (#292)

Bumps [ReportGenerator](https://github.com/danielpalme/ReportGenerator) from 4.5.2 to 4.6.4.
- [Release notes](https://github.com/danielpalme/ReportGenerator/releases)
- [Commits](danielpalme/ReportGenerator@v4.5.2...v4.6.4)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Build.targets

@@ -11,7 +11,7 @@
     <ItemGroup>
         <PackageReference Update="GitVersion.Tool" Version="5.3.7" />
         <PackageReference Update="JetBrains.ReSharper.CommandLineTools" Version="2020.1.4" />
-        <PackageReference Update="ReportGenerator" Version="4.5.2" />
+        <PackageReference Update="ReportGenerator" Version="4.6.4" />
         <PackageReference Update="Rocket.Surgery.Nuke" Version="0.14.0-beta.9" />
     </ItemGroup>
     <ItemGroup>