Bump tar from 7.5.6 to 7.5.7 in /expo-example (#170)

Bumps [tar](https://github.com/isaacs/node-tar) from 7.5.6 to 7.5.7.
- [Release notes](https://github.com/isaacs/node-tar/releases)
- [Changelog](https://github.com/isaacs/node-tar/blob/main/CHANGELOG.md)
- [Commits](isaacs/node-tar@v7.5.6...v7.5.7)

---
updated-dependencies:
- dependency-name: tar
  dependency-version: 7.5.7
  dependency-type: indirect
...

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Author: dependabot[bot]