Update iran.geojson

[iman-abc]

The Iso code is out dated and renew the new code for each provinces

SUMMARY

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[korbit-ai]

I've completed my review and didn't find any issues.

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[github-actions]

Congrats on making your first PR and thank you for contributing to Superset! 🎉 ❤️

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[iman-abc]

My work has stopped. Please speed up the reviewing process and resolve this issue ASAP.

[rusackas]

Please make updates in the Jupyter notebook, or any changes made to geoJSON will be overwritten. Here's a blog post about it: https://preset.io/blog/how-and-when-and-why-to-update-apache-supersets-country-maps/