[BE] bump optree version to 0.12.1 (#130139)

0.12.0 Major Updates:

- Add context manager to temporarily set the dictionary sorting mode
- Add accessor APIs
- Use `stable` tag for `pybind11` for Python 3.13 support
- Fix potential segmentation fault for pickling support

0.12.1 Updates:

- Fix warning regression during import when launch with strict warning filters

Closes #130155
Pull Request resolved: https://github.com/pytorch/pytorch/pull/130139
Approved by: https://github.com/zou3519
ghstack dependencies: #130895

setup.py

@@ -1201,7 +1201,7 @@ def main():
     install_requires += extra_install_requires
 
     extras_require = {
-        "optree": ["optree==0.11.0"],
+        "optree": ["optree>=0.12.0"],
         "opt-einsum": ["opt-einsum>=3.3"],
     }