chore(deps): update dependency gitversion.msbuild to 6.4.0

Author: renovate[bot]

Directory.Packages.props

@@ -31,7 +31,7 @@
     <PackageVersion Include="Microsoft.AspNetCore.Http" Version="2.3.0" />
 
     <!-- Versioning -->
-    <PackageVersion Include="GitVersion.MsBuild" Version="6.3.0" />
+    <PackageVersion Include="GitVersion.MsBuild" Version="6.4.0" />
     <PackageVersion Include="MinVer" Version="6.0.0" />
   </ItemGroup>