Bump GitVersion.MsBuild from 6.0.0 to 6.4.0

---
updated-dependencies:
- dependency-name: GitVersion.MsBuild
  dependency-version: 6.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Directory.Packages.props

@@ -3,7 +3,7 @@
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
   <ItemGroup>
-    <PackageVersion Include="GitVersion.MsBuild" Version="6.0.0" />
+    <PackageVersion Include="GitVersion.MsBuild" Version="6.4.0" />
     <PackageVersion Include="Microsoft.Extensions.Logging" Version="9.0.8" />
     <PackageVersion Include="Microsoft.VisualStudio.Threading.Only" Version="17.14.15" />
   </ItemGroup>