Bump tar-fs in /testassets/InteropTestsGrpcWebWebsite/Tests (#2619)

Bumps [tar-fs](https://github.com/mafintosh/tar-fs) from 3.0.6 to 3.0.8.
- [Commits](mafintosh/tar-fs@v3.0.6...v3.0.8)

---
updated-dependencies:
- dependency-name: tar-fs
  dependency-version: 3.0.8
  dependency-type: indirect
...

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Author: dependabot[bot]