Fixed the faulty dataset links in the codebase

[Sonu0305]

📝 Description

Type: 🪲 bugfix

Updated the faulty links with the working links in two files,
docs/Custom_atomic_data/Custom_atomic_data.ipynb and .github/workflows/benchmarks.yml.

Closes #238

📌 Resources

Examples, notebooks, and links to useful references.

🚦 Testing

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☑️ Checklist

• I requested two reviewers for this pull request
• I updated the documentation according to my changes
• I built the documentation by applying the build_docs label

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[Sonu0305]

Hi @atharva-2001 @andrewfullard @jvshields @wkerzendorf ,
Could you please review when you have a chance, Thank You.

[jvshields]

Woops, meant to close a different pr. Reopened this one.