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

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• 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

[vytas7]

@WilliamBergamin thanks!

Note that resp.text won't work with Falcon 2.0, so maybe we could just tighten the requirements? (Falcon 2.0 is 7 years old now.)

Alternatively one can set resp.data to a bytestring; that already exists even in the 1.x.