Upgrade version-maven-plugin to 2.1

Closes spring-projectsgh-3662

Author: snicoll

spring-boot-dependencies/pom.xml

@@ -2026,7 +2026,7 @@
 				<plugin>
 					<groupId>org.codehaus.mojo</groupId>
 					<artifactId>versions-maven-plugin</artifactId>
-					<version>2.1</version>
+					<version>2.2</version>
 				</plugin>
 				<plugin>
 					<groupId>pl.project13.maven</groupId>