chore(deps): bump sentence-transformers in /backend/python/transformers

Bumps [sentence-transformers](https://github.com/UKPLab/sentence-transformers) from 5.1.0 to 5.1.1.
- [Release notes](https://github.com/UKPLab/sentence-transformers/releases)
- [Commits](huggingface/sentence-transformers@v5.1.0...v5.1.1)

---
updated-dependencies:
- dependency-name: sentence-transformers
  dependency-version: 5.1.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

backend/python/transformers/requirements-cpu.txt

@@ -5,5 +5,5 @@ accelerate
 transformers
 bitsandbytes
 outetts
-sentence-transformers==5.1.0
+sentence-transformers==5.1.1
 protobuf==6.32.0

backend/python/transformers/requirements-cublas11.txt

@@ -6,5 +6,5 @@ accelerate
 transformers
 bitsandbytes
 outetts
-sentence-transformers==5.1.0
+sentence-transformers==5.1.1
 protobuf==6.32.0

backend/python/transformers/requirements-cublas12.txt

@@ -5,5 +5,5 @@ numba==0.60.0
 transformers
 bitsandbytes
 outetts
-sentence-transformers==5.1.0
+sentence-transformers==5.1.1
 protobuf==6.32.0

backend/python/transformers/requirements-hipblas.txt

@@ -7,5 +7,5 @@ numba==0.60.0
 bitsandbytes
 outetts
 bitsandbytes
-sentence-transformers==5.1.0
+sentence-transformers==5.1.1
 protobuf==6.32.0

backend/python/transformers/requirements-intel.txt

@@ -9,5 +9,5 @@ transformers
 intel-extension-for-transformers
 bitsandbytes
 outetts
-sentence-transformers==5.1.0
+sentence-transformers==5.1.1
 protobuf==6.32.0