Update axum requirement from 0.7 to 0.8

Updates the requirements on [axum](https://github.com/tokio-rs/axum) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/axum/releases)
- [Changelog](https://github.com/tokio-rs/axum/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/axum/commits)

---
updated-dependencies:
- dependency-name: axum
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

juniper_axum/Cargo.toml

@@ -25,7 +25,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 subscriptions = ["axum/ws", "juniper_graphql_ws/graphql-ws", "dep:futures"]
 
 [dependencies]
-axum = { version = "0.7", features = ["json", "query"], default-features = false }
+axum = { version = "0.8", features = ["json", "query"], default-features = false }
 futures = { version = "0.3.22", optional = true }
 juniper = { version = "0.16", path = "../juniper", default-features = false }
 juniper_graphql_ws = { version = "0.4.0", path = "../juniper_graphql_ws", features = ["graphql-transport-ws"] }
@@ -38,7 +38,7 @@ bytes = "1.2"
 
 [dev-dependencies]
 anyhow = "1.0"
-axum = { version = "0.7", features = ["http1", "macros", "tokio"] }
+axum = { version = "0.8", features = ["http1", "macros", "tokio"] }
 futures = "0.3.22"
 juniper = { version = "0.16", path = "../juniper", features = ["expose-test-schema"] }
 tokio = { version = "1.20", features = ["macros", "net", "rt-multi-thread", "time"] }