SpringBoot Upgrade to Maven Dependency Plugin 3.3.0 for 2.6.x

Currently this has only been addressed for 2.7.x, which is not released yet. It's better to also fix this in 2.6.x due to the severity of the issue.

See https://github.com/spring-projects/spring-boot/issues/30301 and https://issues.apache.org/jira/browse/MDEP-761

Comment From: scottfrederick

Spring Boot will only upgrade to a new patch version of a dependency in a patch release. For Boot 2.6.x we will only upgrade to a Maven Dependency Plugin version 3.2.x.

You can override the version of the Maven Dependency plugin used in your project by setting a maven-dependency-plugin.version property in your Maven or Gradle build file.