Update action reference to use commit SHA instead of beta tag

Author: grll

action.yml

@@ -114,7 +114,7 @@ runs:
     - name: Run Claude Code
       id: claude-code
       if: steps.prepare.outputs.contains_trigger == 'true'
-      uses: grll/claude-code-base-action@beta
+      uses: grll/claude-code-base-action@9f0fa5eeca1de34e9be1acf05f244e22e4527ca7 # Latest commit from fork
       with:
         prompt_file: /tmp/claude-prompts/claude-prompt.txt
         allowed_tools: ${{ env.ALLOWED_TOOLS }}