Update Gloo submodule (pytorch#164371)

Update Gloo submodule (pytorch#163112)

Which makes PyTorch buildable with gcc-15, tested by running the build inside `fedora:44` docker
```
docker run --rm -it fedora:44 bash -c "yum install -y g++ python3-devel git; git clone https://github.com/pytorch/pytorch; cd pytorch; git checkout 8f710ac; python3 -mpip install -r requirements.txt; python3 setup.py bdist_wheel"
```

Fixes pytorch#156595
Pull Request resolved: pytorch#163112
Approved by: https://github.com/huydhn

(cherry picked from commit 65845d7)

Co-authored-by: Nikita Shulga <[email protected]>

Author: pytorchbot