chore: bump PyTorch version in dependencies & CI

[Borda]

What does this PR do?

Following Torch release of 2.8 - https://github.com/pytorch/pytorch/releases/tag/v2.8.0

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---

📚 Documentation preview 📚: https://pytorch-lightning--21043.org.readthedocs.build/en/21043/

[github-actions]

⛈️ Required checks status: Has failure 🔴

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Groups summary

🔴 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	failure	❌

These checks are required after the changes to .github/workflows/ci-tests-pytorch.yml, requirements/fabric/examples.txt, requirements/pytorch/base.txt, requirements/pytorch/examples.txt, tests/tests_pytorch/trainer/test_trainer.py.

🔴 pytorch_lightning: Azure GPU

Check ID	Status
pytorch-lightning (GPUs) (testing Lightning | latest)	failure	❌
pytorch-lightning (GPUs) (testing PyTorch | latest)	failure	❌

These checks are required after the changes to .azure/gpu-tests-pytorch.yml, requirements/pytorch/base.txt, requirements/pytorch/examples.txt, tests/tests_pytorch/trainer/test_trainer.py, requirements/fabric/examples.txt.

🟢 pytorch_lightning: Benchmarks

Check ID	Status
lightning.Benchmarks	success	✅

These checks are required after the changes to requirements/fabric/examples.txt, requirements/pytorch/base.txt, requirements/pytorch/examples.txt.

🟢 fabric: Docs

Check ID	Status
docs-make (fabric, doctest)	success	✅
docs-make (fabric, html)	success	✅

These checks are required after the changes to requirements/fabric/examples.txt.

🟢 pytorch_lightning: Docs

Check ID	Status
docs-make (pytorch, doctest)	success	✅
docs-make (pytorch, html)	success	✅

These checks are required after the changes to requirements/pytorch/base.txt, requirements/pytorch/examples.txt.

🟢 pytorch_lightning: Docker

Check ID	Status
build-cuda (3.10, 2.1.2, 12.1.1)	success	✅
build-cuda (3.11, 2.2.2, 12.1.1)	success	✅
build-cuda (3.11, 2.3.1, 12.1.1)	success	✅
build-cuda (3.11, 2.4.1, 12.1.1)	success	✅
build-cuda (3.12, 2.5.1, 12.1.1)	success	✅
build-cuda (3.12, 2.6.0, 12.4.1)	success	✅
build-pl (3.10, 2.1, 12.1.1)	success	✅
build-pl (3.11, 2.2, 12.1.1)	success	✅
build-pl (3.11, 2.3, 12.1.1)	success	✅
build-pl (3.11, 2.4, 12.1.1)	success	✅
build-pl (3.12, 2.5, 12.1.1)	success	✅
build-pl (3.12, 2.6, 12.4.1)	success	✅
build-pl (3.12, 2.7, 12.6.3)	success	✅
build-pl (3.12, 2.8, 12.6.3, true)	success	✅

These checks are required after the changes to requirements/pytorch/base.txt, requirements/pytorch/examples.txt, requirements/fabric/examples.txt.

🟢 lightning_fabric: CPU workflow

Check ID	Status
fabric-cpu-guardian	success	✅

These checks are required after the changes to requirements/fabric/examples.txt, tests/tests_fabric/plugins/precision/test_amp_integration.py, tests/tests_fabric/strategies/launchers/test_multiprocessing_integration.py, tests/tests_fabric/strategies/test_ddp_integration.py, tests/tests_fabric/utilities/test_distributed.py, .github/workflows/ci-tests-fabric.yml.

🟢 lightning_fabric: Azure GPU

Check ID	Status
lightning-fabric (GPUs) (testing Fabric | latest)	success	✅
lightning-fabric (GPUs) (testing Lightning | latest)	success	✅

These checks are required after the changes to .azure/gpu-tests-fabric.yml, requirements/fabric/examples.txt, tests/tests_fabric/plugins/precision/test_amp_integration.py, tests/tests_fabric/strategies/launchers/test_multiprocessing_integration.py, tests/tests_fabric/strategies/test_ddp_integration.py, tests/tests_fabric/utilities/test_distributed.py.

🟢 mypy

Check ID	Status
mypy	success	✅

These checks are required after the changes to requirements/fabric/examples.txt, requirements/pytorch/base.txt, requirements/pytorch/examples.txt.

🟢 install

Check ID	Status
install-pkg-guardian	success	✅

These checks are required after the changes to requirements/fabric/examples.txt, requirements/pytorch/base.txt, requirements/pytorch/examples.txt.

---

Thank you for your contribution! 💜

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87%. Comparing base (f067626) to head (636be26).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #21043   +/-   ##
=======================================
- Coverage      87%      87%   -0%     
=======================================
  Files         268      268           
  Lines       23324    23324           
=======================================
- Hits        20316    20313    -3     
- Misses       3008     3011    +3     

[Borda]

memory discrepancy:

_______________ test_multiple_trainer_constant_memory_allocated ________________

tmp_path = PosixPath('/tmp/pytest-of-root/pytest-0/test_multiple_trainer_constant0')

    @RunIf(min_cuda_gpus=1)
    def test_multiple_trainer_constant_memory_allocated(tmp_path):

		...
    
>       assert current_memory() <= initial
E       assert 1024 <= 512
E        +  where 1024 = <function test_multiple_trainer_constant_memory_allocated.<locals>.current_memory at 0x7f41601df100>()