[Python] Use a trusted publisher to release to Pypi.

[brasmusson]

🤔 What's changed?

Use a trusted publisher to release to Pypi.

Pypi now requires 2FA and the a trusted publisher is the recommendation for automated releases. The workflow is renamed release-pypi.yaml to match the trusted publisher definition in for cucumber-expression in Pypi.

⚡️ What's your motivation?

Needed change since Pypi now requires 2FA

🏷️ What kind of change is this?

• :bank: Refactoring/debt/DX (improvement to code design, tooling, documentation etc. without changing behaviour)

♻️ Anything particular you want feedback on?

📋 Checklist:

• [x] I agree to respect and uphold the Cucumber Community Code of Conduct
• [x] Users should know about my change
  • [x] I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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