Fix mypy issue with async resolvers

[patrick91]

From discord, looks like we introduced a regression for mypy in #3241

Not sure why our test suite was passing though, I think before merging we should figure that out (assuming this fixes it properly)

I've updated how we test mypy to prevent similar issue in future

[codecov]

Codecov Report

Attention: Patch coverage is 63.72549% with 111 lines in your changes are missing coverage. Please review.

Project coverage is 94.34%. Comparing base (a7fc70a) to head (c4056c1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3516      +/-   ##
==========================================
- Coverage   96.53%   94.34%   -2.19%     
==========================================
  Files         520      519       -1     
  Lines       33243    32183    -1060     
  Branches     5527     3683    -1844     
==========================================
- Hits        32090    30363    -1727     
- Misses        920     1538     +618     
- Partials      233      282      +49     

[codspeed-hq]

CodSpeed Performance Report

Merging #3516 will not alter performance

_{Comparing fix/mypy-async (c4056c1) with main (a7fc70a)}

Summary

✅ 12 untouched benchmarks

[botberry]

Apollo Federation Subgraph Compatibility Results

Federation 1 Support	Federation 2 Support
_service 🟢 @key (single) 🟢 @key (multi) 🟢 @key (composite) 🟢 repeatable @key 🟢 @requires 🟢 @provides 🟢 federated tracing 🔲	@link 🟢 @shareable 🟢 @tag 🟢 @override 🟢 @inaccessible 🟢 @composeDirective 🟢 @interfaceObject 🟢

Learn more:

• Apollo Federation Subgraph Specification
• Compatibility Tests

[botberry]

Thanks for adding the RELEASE.md file!

Here's a preview of the changelog:

---

This release fixes an issue where mypy would complain when using a typed async
resolver with strawberry.field(resolver=...).

Now the code will type check correctly. We also updated our test suite to make
we catch similar issues in the future.

Here's the tweet text:

🆕 Release (next) is out! This release fixes an issue that caused type
checking errors when using Mypy and async resolvers.

Thanks to @patrick91 for the PR 👏

Get it here 👉 https://strawberry.rocks/release/(next)

[sourcery-ai]

Hey @patrick91 - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 6 issues found
• 🟢 Security: all looks good
• 🟡 Testing: 10 issues found
• 🟢 Complexity: all looks good

---

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