chore(deps): bump pug-code-gen in /test/e2e/oauth2-client (#2376)

Bumps [pug-code-gen](https://github.com/pugjs/pug) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/pugjs/pug/releases)
- [Commits](https://github.com/pugjs/pug/compare/pug-code-gen@2.0.2...pug@2.0.3)

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