Bump bitsandbytes from 0.45.5 to 0.46.0

Bumps [bitsandbytes](https://github.com/bitsandbytes-foundation/bitsandbytes) from 0.45.5 to 0.46.0.
- [Release notes](https://github.com/bitsandbytes-foundation/bitsandbytes/releases)
- [Changelog](https://github.com/bitsandbytes-foundation/bitsandbytes/blob/main/CHANGELOG.md)
- [Commits](bitsandbytes-foundation/bitsandbytes@0.45.5...0.46.0)

---
updated-dependencies:
- dependency-name: bitsandbytes
  dependency-version: 0.46.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -6,7 +6,7 @@ diffusers==0.33.1
 accelerate==1.7.0
 datasets==3.6.0
 huggingface-hub==0.30.2
-bitsandbytes==0.45.5
+bitsandbytes==0.46.0
 peft==0.15.2
 # Common dependencies
 numpy==2.2.6