fix(build): Update new claude-code-action to latest forked-pr-fix branch (#16755)

Summary:
Pull Request resolved: #16755

Update the action reference from the old SHA (2817c54...) to the forked-pr-fix branch head ([hash](izaitsevfb/claude-code-action@ececd56)), which is the branch that the includes forked PR support for the Claude Code plugin that PyTorch [uses](https://github.com/pytorch/test-infra/blob/main/.github/workflows/_claude-code.yml#L116C15-L116C58) too.

Tested on a forked PR:
pratikpugalia#2

Reviewed By: kgpai

Differential Revision: D96374984

fbshipit-source-id: b399ab4ff5d5c3b3ed796f8136ca8d4a1e3377d7

Author: pratikpugalia

.github/workflows/claude.yml

@@ -94,7 +94,7 @@ jobs:
           persist-credentials: false
 
       - name: Run Claude Code
-        uses: izaitsevfb/claude-code-action@2817c54db8f44f3a0485d57292566bf07d428a25 # forked-pr-fix
+        uses: izaitsevfb/claude-code-action@ececd56fb999d06b4dd2477437bc408938295d76 # forked-pr-fix
         with:
           trigger_phrase: "@claude"
           # prompt is only set for workflow_dispatch (agent mode).