Bump NuGet.Configuration from 6.6.1 to 6.7.0 in /eng/dependabot

Bumps [NuGet.Configuration](https://github.com/NuGet/NuGet.Client) from 6.6.1 to 6.7.0.
- [Release notes](https://github.com/NuGet/NuGet.Client/releases)
- [Commits](https://github.com/NuGet/NuGet.Client/commits)

---
updated-dependencies:
- dependency-name: NuGet.Configuration
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

eng/dependabot/Packages.props

@@ -12,7 +12,7 @@
     <PackageReference Update="Microsoft.Extensions.Logging" Version="7.0.0" />
     <PackageReference Update="Microsoft.Extensions.Logging.Console" Version="6.0.0" />
     <PackageReference Update="Microsoft.Extensions.Logging.Abstractions" Version="7.0.1" />
-    <PackageReference Update="NuGet.Configuration" Version="6.6.1" />
+    <PackageReference Update="NuGet.Configuration" Version="6.7.0" />
     <PackageReference Update="NuGet.Credentials" Version="6.6.1" />
     <PackageReference Update="NuGet.Protocol" Version="6.6.1" />