Upgrade versions-maven-plugin 2.19.1 -> 2.20.0 (#2001)

See:
- https://github.com/mojohaus/versions/releases/tag/2.20.0
- mojohaus/versions@2.19.1...2.20.0

Author: Picnic-DevPla-Bot

pom.xml

@@ -1517,7 +1517,7 @@
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>versions-maven-plugin</artifactId>
-                    <version>2.19.1</version>
+                    <version>2.20.0</version>
                     <configuration>
                         <updateBuildOutputTimestampPolicy>never</updateBuildOutputTimestampPolicy>
                     </configuration>