Bump GitVersion.MsBuild from 6.3.0 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
- 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]

src/DependencyGraph.App/DependencyGraph.App.csproj

@@ -25,7 +25,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="6.3.0">
+    <PackageReference Include="GitVersion.MsBuild" Version="6.4.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>

src/DependencyGraph.Core/DependencyGraph.Core.csproj

@@ -20,7 +20,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="GitVersion.MsBuild" Version="6.3.0">
+    <PackageReference Include="GitVersion.MsBuild" Version="6.4.0">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>