chore: update Python setup step to specify version 3.14 for the publish and sign workflow

[danielmarv]

Description:
This pull request adds a Python setup step to the GitHub Actions workflow. The workflow will now ensure that Python 3.14 is available before proceeding with subsequent steps.

Workflow improvements:

• .github/workflows/publish.yml: Added a step to set up Python using actions/setup-python@v6.2.0, specifying python-version: '3.14'.

Related issue(s):

Fixes #

Notes for reviewer:

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between fc67d6f and 31e1296.

📒 Files selected for processing (1)

• .github/workflows/publish.yml

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Walkthrough

A Python 3.14 setup step using actions/setup-python@v6.2.0 was added to the publish-and-sign job in .github/workflows/publish.yml, occurring before artifact download and Sigstore/PyPI publishing steps.

Changes

Cohort / File(s)	Summary
GitHub Actions Workflow .github/workflows/publish.yml	Added a "Set up Python" step to the publish-and-sign job using actions/setup-python@v6.2.0 with python-version: '3.14'; no other job logic changed.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately describes the main change: adding a Python 3.14 setup step to the publish and sign workflow.
Description check	✅ Passed	The description clearly explains the purpose of the change and provides specific details about the workflow file modified and the setup-python action version used.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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[Copilot]

Pull request overview

This PR updates the PyPI publish workflow to ensure a Python runtime is available in the publish-and-sign job (in addition to the existing setup in the build job), supporting signing and publishing release artifacts.

Changes:

• Add an actions/setup-python@v6.2.0 step to the publish-and-sign job in the publish workflow.
• Configure the workflow to use Python 3.14 for that job.

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[danielmarv]

CC @exploreriii
now all runs before the signing works correctly
https://github.com/danielmarv/hiero-sdk-python/actions/runs/24536441051/job/71732499234

[manishdait]

Thanks @danielmarv

[exploreriii]

update branch please @danielmarv