chore(deps): Bump sentence-transformers from 3.3.1 to 3.4.0 in /backend/python/transformers (#4702)

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

Bumps [sentence-transformers](https://github.com/UKPLab/sentence-transformers) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/UKPLab/sentence-transformers/releases)
- [Commits](https://github.com/UKPLab/sentence-transformers/compare/v3.3.1...v3.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

backend/python/transformers/requirements-cpu.txt

@@ -5,4 +5,4 @@ accelerate
 transformers
 bitsandbytes
 outetts
-sentence-transformers==3.3.1
+sentence-transformers==3.4.0

backend/python/transformers/requirements-cublas11.txt

@@ -6,4 +6,4 @@ accelerate
 transformers
 bitsandbytes
 outetts
-sentence-transformers==3.3.1
+sentence-transformers==3.4.0

backend/python/transformers/requirements-cublas12.txt

@@ -5,4 +5,4 @@ numba==0.60.0
 transformers
 bitsandbytes
 outetts
-sentence-transformers==3.3.1
+sentence-transformers==3.4.0

backend/python/transformers/requirements-hipblas.txt

@@ -7,4 +7,4 @@ numba==0.60.0
 bitsandbytes
 outetts
 bitsandbytes
-sentence-transformers==3.3.1
+sentence-transformers==3.4.0

backend/python/transformers/requirements-intel.txt

@@ -8,4 +8,4 @@ numba==0.60.0
 intel-extension-for-transformers
 bitsandbytes
 outetts
-sentence-transformers==3.3.1
+sentence-transformers==3.4.0