Delete redundant .github/workflows/publish_pypi.yml

[dancergraham]

Description

This workflow always fails and is superceded by a workflow in the private repo explosion/wheelmonger

Consider removing this documentation at the same time

Types of change

fix - removing obsolete code

Checklist

• I confirm that I have the right to submit this contribution under the project's MIT license.
• NOT APPLICABLE I ran the tests, and all new and existing tests passed.
• My changes don't require a change to the documentation, or if they do, I've added all required information.

[Copilot]

Pull request overview

Removes an obsolete GitHub Actions workflow that previously attempted to publish spaCy artifacts to PyPI on GitHub Release publication, but is no longer intended to be used.

Changes:

• Delete .github/workflows/publish_pypi.yml (release-published → PyPI upload workflow).

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