Update sea-orm and async-graphql

[bbqsrc]

PR Info

• Closes https://github.com/SeaQL/seaography/issues/123

Breaking Changes

• [ ] Updates sea-orm to v0.11 and async-graphql to v5

[bbqsrc]

Yes, I will look at the breakages in a few days, and update the PR.

The other features discussed in #123 should probably be a separate PR, right?