Wrong example region for China partition

[jizusun]

Describe the issue

https://github.com/aws-actions/configure-aws-credentials/blob/main/README.md#oidc-audience

    - name: Configure AWS Credentials for China region audience
      uses: aws-actions/configure-aws-credentials@v4.1.0
      with:
        audience: sts.amazonaws.com.cn
        aws-region: us-east-3
        role-to-assume: arn:aws-cn:iam::123456789100:role/my-github-actions-role

I guess the aws-region should be something like cn-northwest-1.

[jmklix]

Thanks for this suggestion. Merging your pr

[github-actions]

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