Upgrade to PyTorch 2.11

[swahtz]

This PR is blocked on #571 #572 merging first.

Dependency and Compatibility Updates:

• Upgraded PyTorch from 2.10 to 2.11 across all environment files and documentation, including env/build_environment.yml, env/dev_environment.yml, env/learn_environment.yml, and env/test_environment.yml. [1] [2] [3] [4]
• Added Python 3.14 support in the build matrix, publish matrix, and project classifiers in pyproject.toml. [1] [2] [3]
• Updated CUDA architectures for published wheels to include SM 8.6, matching PyTorch's support.

Documentation Updates:

• Updated the compatibility matrix and installation instructions in docs/installation.rst to reflect PyTorch 2.11, Python 3.14, and the new CUDA architecture support. [1] [2] [3]
• Updated version history in CHANGES.md to document the PyTorch, Python, and CUDA architecture changes.

Internal/Build System Updates:

• Updated Sphinx documentation configuration in devtools/test-release-scripts.sh to use the new PyTorch and CUDA version tags.