fix(falcon/async_resource): replace the use of removed resp.body

[vytas7]

Summary

Testing

Category

• slack_bolt.App and/or its core components
• slack_bolt.async_app.AsyncApp and/or its core components
• Adapters in slack_bolt.adapter
• Document pages under /docs
• Others

Requirements

Please read the Contributing guidelines and Code of Conduct before creating this issue or pull request. By submitting, you are agreeing to those rules.

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run ./scripts/install_all_and_run_tests.sh after making the changes.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @vytas7 to sign the Salesforce Inc. Contributor License Agreement.

[vytas7]

Mypy was actually functioning correctly - resp.body was removed long ago.

(All this could be replaced with a onliner raising HTTPNotFound, especially if you're OK with a JSON error.)

[vytas7]

(I believe I have now signed the CLA.)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.36%. Comparing base (e8222b5) to head (c90d5f9).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1516      +/-   ##
==========================================
+ Coverage   91.30%   91.36%   +0.05%     
==========================================
  Files         228      228              
  Lines        7271     7275       +4     
==========================================
+ Hits         6639     6647       +8     
+ Misses        632      628       -4     

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[WilliamBergamin]

Thanks for this contribution and interest in our project 🙏

Sometimes we need to close and reopen the issue to force the CLA tool to retrigger

[WilliamBergamin]

Thanks for your time an interest in our project 🙏

I mirrored the changes in the sync implementation and added unit tests to cover this logic