Mark maven plugin as thread safe

[Dunemaster]

Currently, the plugin is not marked thread-safe which results in the following message when building, for example, spring boot using parallel builder

$ mvnw clean package -T3 -DskipTests --offline

[WARNING] *****************************************************************
[WARNING] The following plugins are not marked @threadSafe in Spring Boot Docs:
[WARNING] *****************************************************************
[WARNING] * Your build is requesting parallel execution, but project      *
[WARNING] * contains the following plugin(s) that have goals not marked   *
[WARNING] * as @threadSafe to support parallel building.                  *
[WARNING] * While this /may/ work fine, please look for plugin updates    *
[WARNING] * and/or request plugins be made thread-safe.                   *
[WARNING] io.spring.javaformat:spring-javaformat-maven-plugin:0.0.15
[WARNING] Enable debug to see more precisely which goals are not marked @threadSafe.
[WARNING] *****************************************************************
[WARNING] * If reporting an issue, report it against the plugin in        *
[WARNING] * question, not against maven-core                              *
[WARNING] *****************************************************************
[WARNING] The following plugins are not marked @threadSafe in Spring Boot Actuator Starter:
[WARNING] io.spring.javaformat:spring-javaformat-maven-plugin:0.0.15
[WARNING] Enable debug to see more precisely which goals are not marked @threadSafe.
[WARNING] *****************************************************************

[Dunemaster]

I looked through the code, and it seems thread-safe for me, so it should be just a matter of setting threadsafe = true in the @Mojo annotations

[philwebb]

Fixed in f57fa92 (accidentally referenced the wrong issue).