PEP 774: Remove stale section

Author: savannahostrowski

peps/pep-0774.rst

@@ -221,9 +221,7 @@ process. Additional tooling would be required to fetch the stencils and
 potentially create additional and unnecessary failure points in the workflow.
 This separation also makes it harder to ensure consistency between the stencils
 and the CPython source tree, as updates must be coordinated across the
-repositories. Finally, this approach introduces an attack vector, as external
-repositories are less integrated with our workflows, making provenance and
-integrity harder to guarantee.
+repositories.
 
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