Remove tool run from dotnet nbgv invocation

I have an Azure Pipeline where `InsertVersionsValues.ps1` (in the microbuild branch) works but this step fails, and the only difference is that one omits `tool run` from `dotnet nbgv`.

I continue to believe this is a bug in the `dotnet tool` command.

azure-pipelines/build.yml

@@ -17,7 +17,7 @@ jobs:
  clean: true
  - template: install-dependencies.yml
 
- - script: dotnet tool run nbgv cloud -c
+ - script: dotnet nbgv cloud -c
  displayName: ⚙ Set build number
 
  - template: dotnet.yml