Update ASP.NET Core and Problem Details API RFC references

[verdantburrito]

Pull Request Checklist

• I have read and followed the CONTRIBUTING.md guidelines.
• My contribution adds a new instruction, prompt, agent, or skill file in the correct directory.
• The file follows the required naming convention.
• The content is clearly structured and follows the example format.
• I have tested my instructions, prompt, agent, or skill with GitHub Copilot.
• I have run npm start and verified that README.md is up to date.

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Description

1. Updated ASP.NET Core version references (9 -> 10).
   • Continues the work of pull requests #397 and #411.
2. Updated Problem Details API RFC references (7807 -> 9457).
   • RFC 9457 supercedes RFC 7807.

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Type of Contribution

• New instruction file.
• New prompt file.
• New agent file.
• New collection file.
• New skill file.
• Update to existing instruction, prompt, agent, collection or skill.
• Other (please specify):

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Additional Notes

N/A

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