Update safetensors requirement from 0.3.1 to 0.4.1 (#1591)

Updates the requirements on [safetensors](https://github.com/huggingface/safetensors) to permit the latest version.
- [Release notes](https://github.com/huggingface/safetensors/releases)
- [Changelog](https://github.com/huggingface/safetensors/blob/main/RELEASE.md)
- [Commits](https://github.com/huggingface/safetensors/compare/v0.3.1...v0.3.3)

---
updated-dependencies:
- dependency-name: safetensors
  dependency-type: direct:production
...

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Cargo.toml

@@ -58,7 +58,7 @@ rand = "0.8.5"
 rand_distr = "0.4.3"
 rayon = "1.7.0"
 rusttype = { version = "0.9", default-features = false }
-safetensors = "0.3.1"
+safetensors = "0.4.1"
 serde = { version = "1.0.171", features = ["derive"] }
 serde_plain = "1.0.2"
 serde_json = "1.0.99"