Bump NuGet.Protocol from 6.6.0 to 6.8.0 in /eng/dependabot#449

dependabot[bot] wants to merge 1 commit intorelease/7.0.4xxGangWang01/templating:release/7.0.4xxfrom

dependabot/nuget/eng/dependabot/release/7.0.4xx/NuGet.Protocol-6.8.0GangWang01/templating:dependabot/nuget/eng/dependabot/release/7.0.4xx/NuGet.Protocol-6.8.0Copy head branch name to clipboard