[helly25]

Update the README dependency example to 0.8.0 so the signed release tag passes the release preparation check and ships current installation instructions.

AG;DR

• MODULE.bazel and CHANGELOG.md already declare 0.8.0; this completes the tracked release references after Add version normalization and configurable suffix rendering #78 merged.
• Validation: focused pre-commit checks, release preparation check, and all 46 Python tests passed. Main CI for Add version normalization and configurable suffix rendering #78's merge is green.
• Merge this preparation before tagging 0.8.0. The release unblocks removal of temporary bzl overrides in the consumer PRs.