Bumps ethereum/client-go from v1.13.7 to v1.13.8.

---
updated-dependencies:
- dependency-name: ethereum/client-go
  dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>