build(deps): 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/compare/0.6.0...0.6.1)

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

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

Cargo.toml

@@ -75,7 +75,7 @@ libc = { version = "0.2.105", default-features = false }
 log = { version = "0.4", default-features = false }
 netns-rs = { version = "0.1", default-features = false }
 nix = { version = "0.26.2", default-features = false }
-num_enum = { version = "0.6", default-features = false }
+num_enum = { version = "0.7", default-features = false }
 object = { version = "0.32", default-features = false }
 parking_lot = { version = "0.12.0", default-features = false }
 proc-macro-error = { version = "1.0", default-features = false }