Bump System.Threading.Tasks.Dataflow from 6.0.0 to 7.0.0

Bumps [System.Threading.Tasks.Dataflow](https://github.com/dotnet/runtime) from 6.0.0 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v6.0.0...v7.0.0)

---
updated-dependencies:
- dependency-name: System.Threading.Tasks.Dataflow
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

test/Nerdbank.GitVersioning.Tests/Nerdbank.GitVersioning.Tests.csproj

@@ -43,7 +43,7 @@
     <PackageReference Include="Nerdbank.GitVersioning.LKG" Version="3.4.173-alpha" />
     <PackageReference Include="Newtonsoft.Json.Schema" Version="3.0.14" />
     <PackageReference Include="System.Memory" Version="4.5.5" />
-    <PackageReference Include="System.Threading.Tasks.Dataflow" Version="6.0.0" />
+    <PackageReference Include="System.Threading.Tasks.Dataflow" Version="7.0.0" />
     <PackageReference Include="Xunit.Combinatorial" Version="1.5.25" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />
     <PackageReference Include="Xunit.SkippableFact" Version="1.4.13" />