Bump semver-regex and babel-cli in /samples/graphiql-client

Removes [semver-regex](https://github.com/sindresorhus/semver-regex). It's no longer used after updating ancestor dependency [babel-cli](https://github.com/babel/babel). These dependencies need to be updated together.


Removes `semver-regex`

Updates `babel-cli` from 6.6.5 to 6.26.0
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/v6.26.0/CHANGELOG.md)
- [Commits](babel/babel@v6.6.5...v6.26.0)

---
updated-dependencies:
- dependency-name: semver-regex
  dependency-type: indirect
- dependency-name: babel-cli
  dependency-type: direct:development
...

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Author: dependabot[bot]