vocab: add original spm model

Taken from: https://console.cloud.google.com/storage/browser/_details/t5-data/vocabs/umt5.256000/sentencepiece.model;tab=live_object

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spiece.model ADDED Viewed

+version https://git-lfs.github.com/spec/v1
+oid sha256:e3909a67b780650b35cf529ac782ad2b6b26e6d1f849d3fbb6a872905f452458
+size 4548313