Bump torch from 2.6.0 to 2.8.0 in /requirements

Bumps [torch](https://github.com/pytorch/pytorch) from 2.6.0 to 2.8.0.
- [Release notes](https://github.com/pytorch/pytorch/releases)
- [Changelog](https://github.com/pytorch/pytorch/blob/main/RELEASE.md)
- [Commits](pytorch/pytorch@v2.6.0...v2.8.0)

---
updated-dependencies:
- dependency-name: torch
  dependency-version: 2.8.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/cpu-build.txt

@@ -6,7 +6,7 @@ packaging>=24.2
 setuptools>=77.0.3,<80.0.0
 setuptools-scm>=8
 --extra-index-url https://download.pytorch.org/whl/cpu
-torch==2.6.0+cpu
+torch==2.8.0
 wheel
 jinja2>=3.1.6
 regex

requirements/cpu.txt

@@ -8,7 +8,7 @@ numba == 0.61.2; python_version > '3.9' and platform_machine != "s390x"
 packaging>=24.2
 setuptools>=77.0.3,<80.0.0
 --extra-index-url https://download.pytorch.org/whl/cpu
-torch==2.6.0+cpu; platform_machine == "x86_64" # torch>2.6.0+cpu has performance regression on x86 platform, see https://github.com/pytorch/pytorch/pull/151218
+torch==2.8.0; platform_machine == "x86_64" # torch>2.6.0+cpu has performance regression on x86 platform, see https://github.com/pytorch/pytorch/pull/151218
 torch==2.8.0; platform_system == "Darwin"
 torch==2.8.0; platform_machine == "ppc64le" or platform_machine == "aarch64"
 

requirements/test.txt

@@ -1078,7 +1078,7 @@ tomli==2.2.1
     # via schemathesis
 tomli-w==1.2.0
     # via schemathesis
-torch==2.8.0+cu128
+torch==2.8.0
     # via
     #   -r requirements/test.in
     #   accelerate