revert "convert to safetensors"

This reverts commit e6202634abdb3b191606ca4c2455c94c3a62c16e.

As per Henk's suggestion. Safetensor support on Kobold is still a
little iffy, so let's keep the usual pickled models for now.

model.safetensors → pytorch_model.bin

@@ -1,3 +1,3 @@
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-size 5436886456
+oid sha256:81840c515baa22ee87d9bcd53d62f06d51a058947739e88011dcaec858ebb383
+size 5436910620