Update async-graphql requirement from 5.0 to 6.0

[dependabot]

Updates the requirements on async-graphql to permit the latest version.

Changelog

Sourced from async-graphql's changelog.

[6.0.0] 2023-07-29

• Bump syn from 1.0 to 2.0
• Bump darling from 0.14 to 0.20
• Bump indexmap from 1.6.2 to 2
• Attributes guard, process_with, complexity support expression or string as value #1295
• Schema (type) level directive support with optional support of federation composeDirective #1308
• Add support for generic structs derriving InputObject and SimpleObject #1313
• chore: trim up some unnecessary code #1324
• Adds Dataloader::get_cached_values method to the dataloader cache so that callers can access the contents of the cache without knowing the keys. #1326

Breaking Changes

• Since syn 2.0 no longer supports keywords as meta path, rename the parameter used to specify interface field types from type to ty.

  dtolnay/syn#1458 TedDriggs/darling#238

#[derive(Interface)]
#[graphql(field(name = "id", ty = "&i32"))] // rename from type to ty
enum Node {
    MyObj(MyObj),
}

• Change the parameter location of the macro Directive to PascalCase

// #[Directive(location = "field")]
#[Directive(location = "Field")]
pub fn lowercase() -> impl CustomDirective {
    LowercaseDirective
}

[5.0.10] 2023-06-07

• Upgrade opentelemetry to 0.19.0 #1252
• Remove internal CursorScalar type and expose Edge::cursor member #1302

[5.0.9] 2023-05-25

• Prevent input check stack overflow #1293
• Change batch requests to run concurrently #1290

[5.0.8] 2023-05-09

• Improve documentation about DataloaderImprove documentation about Dataloader #1282
• Prevent recursive input type checking from hitting stack overflow #1284

... (truncated)

Commits

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[dependabot]

Looks like async-graphql is up-to-date now, so this is no longer needed.