Added script for onnx v1.21.0

[SakshiJain0302]

Checklist

• Have you checked and followed all the points mention in the CONTRIBUTING.MD
• Have you validated script on UBI 9 container
• Did you run the script(s) on fresh container with set -e option enabled and observe success ?
• Did you have Legal approvals for patch files ?

[github-actions]

@SakshiJain0302

  **Reminder 1**

  This PR has had **no activity for 20 days**.
  Please respond to keep it active.

[github-actions]

@SakshiJain0302

  **Reminder 2**

  This PR has had **no activity for 40 days**.
  Please update or respond to avoid future action.

[shivansh-ibm]

@SakshiJain0302 , you can close this pr. We have raised another pr : #8753