Update plugin com.github.ben-manes.versions to v0.50.0

Author: renovate[bot]

build.gradle

@@ -2,7 +2,7 @@ plugins {
     id 'checkstyle'
     id 'io.spring.dependency-management' version '1.0.9.RELEASE'
     id 'org.springframework.boot' version '2.2.5.RELEASE'
-    id 'com.github.ben-manes.versions' version '0.47.0'
+    id 'com.github.ben-manes.versions' version '0.50.0'
     id 'com.jfrog.bintray' version '1.8.5'
     id 'java-library'
     id 'maven'