Bump the janus group in /divviup/rust with 2 updates

Bumps the janus group in /divviup/rust with 2 updates: [janus_core](https://github.com/divviup/janus) and [janus_messages](https://github.com/divviup/janus).


Updates `janus_core` from 0.7.39 to 0.7.40
- [Release notes](https://github.com/divviup/janus/releases)
- [Commits](divviup/janus@0.7.39...0.7.40)

Updates `janus_messages` from 0.7.39 to 0.7.40
- [Release notes](https://github.com/divviup/janus/releases)
- [Commits](divviup/janus@0.7.39...0.7.40)

---
updated-dependencies:
- dependency-name: janus_core
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: janus
- dependency-name: janus_messages
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: janus
...

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

divviup/rust/Cargo.toml

@@ -8,7 +8,7 @@ publish = false
 crate-type = ["cdylib"]
 
 [dependencies]
-janus_core = "0.7.39"
+janus_core = "0.7.40"
 janus_messages = "0.7.2"
 jni = "0.21.1"
 prio = "0.16.7"