Bump apex to c0f56f7e for release/2.11 (#3391)

## Summary
Updates the apex pinned commit in `related_commits` for the ROCm apex
`release/1.11.0` branch, from `973a363235cd056e9da83716aabdd2691df9e70a`
to `c0f56f7eccd343a08a1b0d0be59f1e7e0e9b90b7` (both ubuntu and centos
lines).

This bump brings in a cherry-pick of ROCm/apex PR #334
(ROCm/apex#334), which fixes non-contiguous
inputs in the fused RoPE aiter backend by enforcing last-dim contiguity
at the apex/aiter boundary (fixing the "rope_2d_bwd_impl requires all
stride_d to be 1" crash on transposed inputs and broadcast/expanded
gradients). This is purely a dependency pin update to pull in the fix,
not a PyTorch code change.

## Test plan
- [ ] Metadata-only change to the `related_commits` pin file; CI
validates apex builds against the new pin.

Authored with the assistance of Claude (Anthropic AI assistant).

Author: albmalamd

related_commits

@@ -1,5 +1,5 @@
-ubuntu|pytorch|apex|release/1.11.0|973a363235cd056e9da83716aabdd2691df9e70a|https://github.com/ROCm/apex
-centos|pytorch|apex|release/1.11.0|973a363235cd056e9da83716aabdd2691df9e70a|https://github.com/ROCm/apex
+ubuntu|pytorch|apex|release/1.11.0|c0f56f7eccd343a08a1b0d0be59f1e7e0e9b90b7|https://github.com/ROCm/apex
+centos|pytorch|apex|release/1.11.0|c0f56f7eccd343a08a1b0d0be59f1e7e0e9b90b7|https://github.com/ROCm/apex
 ubuntu|pytorch|torchvision|release/0.26|f37951448379bca5dfb29f6f345a80e721ea477c|https://github.com/ROCm/vision
 centos|pytorch|torchvision|release/0.26|f37951448379bca5dfb29f6f345a80e721ea477c|https://github.com/ROCm/vision
 ubuntu|pytorch|torchdata|release/0.11|377e64c1be69a9be6649d14c9e3664070323e464|https://github.com/pytorch/data