Re-export the Vulkan fp16 variant with rank-3 attention

Same rewrite as all-MiniLM-L6-v2: attention runs as [H, T, D] batched matmuls
instead of reshaping to 4-D, which removes the materialised view dispatches
those reshapes produce on Vulkan. Bit-identical on CPU.

vulkan/all_mpnet_base_v2_vulkan_fp16.pte

@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:d891d3f6d3177d751edde4f4c9f436a05f7346addaf865a6ab8431830cf8b1a6
-size 217946754
+oid sha256:da3a11480c05851c42a0e5855d16700a6686abda15f30cfdefb57395819d4c98
+size 217937154