chore(deps): bump the pip group in /backend/python/coqui with 2 updates

Bumps the pip group in /backend/python/coqui with 2 updates: torch and [transformers](https://github.com/huggingface/transformers).


Updates `torch` from 2.3.1+cxx11.abi to 2.6.0+cu118

Updates `transformers` from 4.48.3 to 4.50.0
- [Release notes](https://github.com/huggingface/transformers/releases)
- [Commits](https://github.com/huggingface/transformers/compare/v4.48.3...v4.50.0)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.6.0+cu118
  dependency-type: direct:production
  dependency-group: pip
- dependency-name: transformers
  dependency-version: 4.50.0
  dependency-type: direct:production
  dependency-group: pip
...

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

backend/python/coqui/requirements-cpu.txt

@@ -1,4 +1,4 @@
-transformers==4.48.3
+transformers==4.50.0
 accelerate
-torch==2.4.1
+torch==2.6.0+cu118
 coqui-tts

backend/python/coqui/requirements-cublas11.txt

@@ -1,6 +1,6 @@
 --extra-index-url https://download.pytorch.org/whl/cu118
-torch==2.4.1+cu118
+torch==2.6.0+cu118
 torchaudio==2.4.1+cu118
-transformers==4.48.3
+transformers==4.50.0
 accelerate
 coqui-tts

backend/python/coqui/requirements-cublas12.txt

@@ -1,5 +1,5 @@
-torch==2.4.1
+torch==2.6.0+cu118
 torchaudio==2.4.1
-transformers==4.48.3
+transformers==4.50.0
 accelerate
 coqui-tts

backend/python/coqui/requirements-hipblas.txt

@@ -1,6 +1,6 @@
 --extra-index-url https://download.pytorch.org/whl/rocm6.0
-torch==2.4.1+rocm6.0
+torch==2.6.0+cu118
 torchaudio==2.4.1+rocm6.0
-transformers==4.48.3
+transformers==4.50.0
 accelerate
 coqui-tts

backend/python/coqui/requirements-intel.txt

@@ -1,10 +1,10 @@
 --extra-index-url https://pytorch-extension.intel.com/release-whl/stable/xpu/us/
 intel-extension-for-pytorch==2.3.110+xpu
-torch==2.3.1+cxx11.abi
+torch==2.6.0+cu118
 torchaudio==2.3.1+cxx11.abi
 oneccl_bind_pt==2.3.100+xpu
 optimum[openvino]
 setuptools
-transformers==4.48.3
+transformers==4.50.0
 accelerate
 coqui-tts