Bugfix/no 3385

[shmoon-kr]

Description

Fix a bug "a custom resolver with permission_classes doesn't accept @sync_to_async decorator" The root cause was inspect.iscoroutinefunction() function returns True only for functions defined with "async def". Now is_async function returns True for a resolver function decorated with @sync_to_async

Types of Changes

• [ ] Core
• [x] Bugfix
• [ ] New feature
• [ ] Enhancement/optimization
• [ ] Documentation

Issues Fixed or Closed by This PR

• https://github.com/strawberry-graphql/strawberry/issues/3385

Checklist

• [X] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [X] I have read the CONTRIBUTING document.
• [X] I have added tests to cover my changes.
• [X] I have tested the changes and verified that they work and don't break anything (as well as I can manage).

Summary by Sourcery

Fix the issue where custom resolvers with permission_classes did not work with the @sync_to_async decorator by updating the is_async function to recognize SyncToAsync instances.

Bug Fixes:

• Fix a bug where a custom resolver with permission_classes did not accept the @sync_to_async decorator by updating the is_async function to correctly identify such functions.

Documentation:

• Add a RELEASE.md file to document the patch release fixing the bug with custom resolvers and @sync_to_async.

Tests:

• Add a test to verify that a resolver function decorated with @sync_to_async works correctly with permission_classes.