Bump ejs from 3.1.9 to 3.1.10 in /example/react-app-example (#438)

Bumps [ejs](https://github.com/mde/ejs) from 3.1.9 to 3.1.10.
- [Release notes](https://github.com/mde/ejs/releases)
- [Commits](mde/ejs@v3.1.9...v3.1.10)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
...

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