🧩 Intermediate Contributors

This issue is intended for contributors who already have some familiarity with the
Hiero Python SDK codebase and contribution workflow.

You should feel comfortable:

• navigating existing source code and examples
• understanding SDK concepts without step-by-step guidance
• following the standard PR workflow without additional onboarding

If this is your very first contribution to the project, we recommend starting with a few
Good First Issues before working on this one.

🐞 Problem Description

In several places we are using set_key

DeprecationWarning: The 'set_key' method is deprecated, Use set_key_without_alias instead.

💡 Expected Solution

We should update uses of set_key and for set_key_without_alias and ensure everything functions as expected

🧠 Implementation Notes

Remove uses of set_key in examples, src, tests and replace with set_key_without_alias if it is safe to do so

✅ Acceptance Criteria

To merge this issue, the pull request must:

• Fully address the problem described above
• Follow existing project conventions and patterns
• Include tests or example updates where appropriate
• Pass all CI checks
• Include a valid changelog entry
• Use DCO and GPG-signed commits

📚 Additional Context or Resources

• SDK Developer Docs
• SDK Developer Training