chore(deps): bump async-graphql from 7.0.13 to 7.0.15 in the axum group

Bumps the axum group with 1 update: [async-graphql](https://github.com/async-graphql/async-graphql).


Updates `async-graphql` from 7.0.13 to 7.0.15
- [Changelog](https://github.com/async-graphql/async-graphql/blob/master/CHANGELOG.md)
- [Commits](https://github.com/async-graphql/async-graphql/commits)

---
updated-dependencies:
- dependency-name: async-graphql
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: axum
...

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

Author: dependabot[bot]