chore(deps): bump torch from 2.3.1+cxx11.abi to 2.8.0 in /backend/python/coqui (#6099)

chore(deps): bump torch in /backend/python/coqui

Bumps [torch](https://github.com/pytorch/pytorch) from 2.3.1+cxx11.abi to 2.8.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](https://github.com/pytorch/pytorch/commits/v2.8.0)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.8.0
  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/coqui/requirements-cpu.txt

@@ -1,4 +1,4 @@
 transformers==4.48.3
 accelerate
-torch==2.4.1
+torch==2.8.0
 coqui-tts

backend/python/coqui/requirements-cublas11.txt

@@ -1,5 +1,5 @@
 --extra-index-url https://download.pytorch.org/whl/cu118
-torch==2.4.1+cu118
+torch==2.8.0
 torchaudio==2.4.1+cu118
 transformers==4.48.3
 accelerate

backend/python/coqui/requirements-cublas12.txt

@@ -1,4 +1,4 @@
-torch==2.4.1
+torch==2.8.0
 torchaudio==2.4.1
 transformers==4.48.3
 accelerate

backend/python/coqui/requirements-hipblas.txt

@@ -1,5 +1,5 @@
 --extra-index-url https://download.pytorch.org/whl/rocm6.0
-torch==2.4.1+rocm6.0
+torch==2.8.0
 torchaudio==2.4.1+rocm6.0
 transformers==4.48.3
 accelerate

backend/python/coqui/requirements-intel.txt

@@ -1,6 +1,6 @@
 --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==2.8.0
 torchaudio==2.3.1+cxx11.abi
 oneccl_bind_pt==2.3.100+xpu
 optimum[openvino]