build(deps): update num_enum requirement from 0.5 to 0.6

Updates the requirements on [num_enum](https://github.com/illicitonion/num_enum) to permit the latest version.
- [Release notes](https://github.com/illicitonion/num_enum/releases)
- [Commits](illicitonion/num_enum@0.5.0...0.6.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

android-activity/Cargo.toml

@@ -29,7 +29,7 @@ ndk = "0.7"
 ndk-sys = "0.4"
 ndk-context = "0.1"
 android-properties = "0.2"
-num_enum = "0.5"
+num_enum = "0.6"
 bitflags = "1.3"
 libc = "0.2"