build(deps-dev): bump strawberry-graphql from 0.316.0 to 0.320.0

Bumps [strawberry-graphql](https://github.com/sponsors/strawberry-graphql) from 0.316.0 to 0.320.0.
- [Commits](https://github.com/sponsors/strawberry-graphql/commits)

---
updated-dependencies:
- dependency-name: strawberry-graphql
  dependency-version: 0.320.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]