up app rate limit to 6000 per app

[sikanderakbarali]

Summary

• Routine Change
• ❗ Breaking Change
• 🤖 Operational or Infrastructure Change
• ✨ New Feature
• ⚠️ Potential issues that might be caused by this change

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Reviews Required

• Dev
• Test
• Tech Author
• Product Owner

Review Checklist

ℹ️ This section is to be filled in by the reviewer.

• I have reviewed the changes in this PR and they fill all or part of the acceptance criteria of the ticket, and the code is in a mergeable state.
• If there were infrastructure, operational, or build changes, I have made sure there is sufficient evidence that the changes will work.
• I have ensured the changelog has been updated by the submitter, if necessary.

[johncollinson2001]

Can we also update the OAS section on rate limiting?

service-search-api/specification/service-search-api.yaml

Line 80 in 22936b3

* 2400 requests per minute per application