Change version detection in updatecli for client libs

[theletterf]

This replaces the version detection method for the client libs added to the updatecli config in #2310, as they seem to pick up 8.x instead of 9.x versions (example is #2317).

[lcawl]

Thanks for the fix! It would be nice in the long term if the tooling could respect the "latest" tag (e.g. https://github.com/elastic/elasticsearch-rs/releases/latest)

[theletterf]

@lcawl Fix works I think: #2317

If we want to transform the alpha version to something else, we could modify the transform block for each to do this:

 latest-elasticsearch-client-rust-version:
    name: Get latest release version for Elasticsearch Rust Client
    kind: githubrelease
    transformers:
      - trimprefix: v
      - replacer:
          from: "-alpha."
          to: "a"

This would transform:

• v9.1.0-alpha.1 → 9.1.0-alpha.1 (after trimprefix)
• 9.1.0-alpha.1 → 9.1.0a1 (after replacer)