Bump safetensors from 0.5.0 to 0.5.2 in /app

Bumps [safetensors](https://github.com/huggingface/safetensors) from 0.5.0 to 0.5.2.
- [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/v0.5.0...v0.5.2)

---
updated-dependencies:
- dependency-name: safetensors
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

app/requirements.txt

@@ -5,7 +5,7 @@ transformers==4.48.1
 xformers==0.0.29.post2
 
 invisible_watermark # To help viewers identify the images as machine-generated.
-safetensors==0.5.0 # To store tensors safely.
+safetensors==0.5.2 # To store tensors safely.
 controlnet_aux
 
 Pillow