Update num_enum requirement from 0.6 to 0.7

Updates the requirements on [num_enum](https://github.com/illicitonion/num_enum) to permit the latest version.
- [Commits](https://github.com/illicitonion/num_enum/commits)

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

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

Cargo.toml

@@ -14,7 +14,7 @@ async-trait = "0.1"
 bincode = "1"
 futures = "0.3"
 ipnet = { version = "2", features = ["serde"] }
-num_enum = "0.6"
+num_enum = "0.7"
 quinn = "0.10"
 semver = "1"
 serde = { version = "1", features = ["derive"] }