Revert "Opt into uploading PEP 740 digital publish attestations to PyPI (#1342)"

This reverts commit 3fb6f56.

Author: hynek

.github/workflows/pypi-package.yml

@@ -48,7 +48,6 @@ jobs:
       - name: Upload package to Test PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          attestations: true
           repository-url: https://test.pypi.org/legacy/
 
   # Upload to real PyPI on GitHub Releases.
@@ -68,5 +67,3 @@ jobs:
 
       - name: Upload package to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
-        with:
-          attestations: true