Fix CodeQL warning to prevent stack trace exposure in JSON-RPC responses

[manishdait]

CodeQL reported a potential information exposure issue (py/stack-trace-exposure) in tck/server.py.

• https://github.com/hiero-ledger/hiero-sdk-python/security/code-scanning/14
• https://github.com/hiero-ledger/hiero-sdk-python/security/code-scanning/13

[github-actions]

Thanks for your submission.

This issue is awaiting approval from @hiero-ledger/hiero-sdk-python-triage and @hiero-ledger/hiero-sdk-python-committers and @hiero-ledger/hiero-sdk-python-maintainers.

[github-actions]

Approved by @hiero-ledger/hiero-sdk-python-triage and @hiero-ledger/hiero-sdk-python-committers and @hiero-ledger/hiero-sdk-python-maintainers.