fix: Fix dependency for client example

[fjuma]

Description

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Follows up on #149

[gemini-code-assist]

Summary of Changes

Hello @fjuma, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request resolves an issue where a client example was incorrectly configured to use the core SDK dependency instead of the dedicated client SDK. The change ensures the example's dependencies are accurate, improving its functionality and correctness.

Highlights

• Dependency Correction: The HelloWorldRunner.java client example's dependency was updated from a2a-java-sdk-core to a2a-java-sdk-client to ensure it uses the correct SDK for client-side operations.

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[gemini-code-assist]

Code Review

This pull request addresses a dependency issue in the JBang script for the HelloWorldClient example. The change correctly updates the dependency from a2a-java-sdk-core to a2a-java-sdk-client, which is necessary for the script to run as it uses classes from the client artifact. This change aligns the JBang script with the example's Maven configuration. The fix is straightforward and correct, and I have no further comments.