'ng update @angular/cli' failed when we use npm package which is use git repo url directly!

[liwonder]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Area

- [x] devkit
- [ ] schematics

Versions

node version: v8.11.2
npm version: 6.1.0
macOS (High Sierra 10.13.4 (17E202))

Repro steps

we have a package.json file with a dependency using git repo url directly like below:
"dependencies": { "someRepo": "https://github.com/company/someRepo.git", }

I was update our Angular 5.0 project to Angular 6.0, and according to the guideline in 'https://update.angular.io/'

npm install -g @angular/cli
npm install @angular/cli
ng update @angular/cli

The log given by the failure

It will log 'someRepo' not found, and also the angular.json file is not found.

Desired functionality

Mention any other details that might be useful

when I remove this line, the update would be success.
someRepo": "https://github.com/company/someRepo.git

[alan-agius4]

Duplicate of #10642

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