[CI] pin working pier
-https://ci-piers.urbit.org/zod-db0f014d8735bc4a2ac1eec840c80903c18d4c3f.tgz
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+https://ci-piers.urbit.org/zod-8a01c3a5f3b4a18684bb8ba8624cc02768b037a8.tgz
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