guides: remove manual Sigstore steps from publishing guide #1859
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These steps are superfluous now that gh-action-pypi-publish generates and uploads PEP 740-compatible attestations by default on its own.
(They also served a slightly different purpose than PEP 740 attestations, since they were never uploaded to PyPI and used a different format.)
Closes #1788.
+CC @webknjaz @di for review 🙂