Bump com.github.ben-manes.versions in /examples/write-behind-rxjava

Bumps com.github.ben-manes.versions from 0.50.0 to 0.51.0.

---
updated-dependencies:
- dependency-name: com.github.ben-manes.versions
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

examples/write-behind-rxjava/gradle/libs.versions.toml

@@ -3,7 +3,7 @@ awaitility = "4.2.0"
 caffeine = "3.1.8"
 junit = "5.10.1"
 rxjava = "3.1.8"
-versions = "0.50.0"
+versions = "0.51.0"
 
 [libraries]
 awaitility = { module = "org.awaitility:awaitility", version.ref = "awaitility" }