Bump com.github.ben-manes.versions from 0.50.0 to 0.51.0 (#399)

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
...

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gradle/libs.versions.toml

@@ -7,7 +7,7 @@ dokka = { id = "org.jetbrains.dokka", version = "1.9.10" }
 ktlint = { id = "org.jlleitschuh.gradle.ktlint", version = "11.6.1" }
 maven-publish = { id = "com.vanniktech.maven.publish", version = "0.27.0" }
 plugin-publish = { id = "com.gradle.plugin-publish", version = "1.2.1" }
-versions = { id = "com.github.ben-manes.versions", version = "0.50.0" }
+versions = { id = "com.github.ben-manes.versions", version = "0.51.0" }
 
 [libraries]
 android-plugin = { module = "com.android.tools.build:gradle", version = "3.6.4" }