MuleLifecycleMapping refers to non existing plugin

[ca-stefan-cordes]

/mule-maven-plugin/mule-maven-plugin/src/main/java/org/mule/tools/maven/mojo/model/lifecycle/mapping/project/MuleLifecycleMapping.java
is referring to maven-site-plugin:3.6.1 but that is not existing.
https://search.maven.org/search?q=g:org.apache.maven.plugins%20AND%20a:maven-site-plugin&core=gav

Problem is that

• Create a blank new Mule4 project
• mvn org.apache.maven.plugins:maven-dependency-plugin:3.1.1:go-offline
  => fails with
  [ERROR] Failed to execute goal org.apache.maven.plugins:maven-dependency-plugin:3.1.1:resolve-plugins (resolve-plugins) on project bug-xmlmodule-fails: Could not find artifact org.apache.maven.plugins:maven-site-plugin:jar:3.6.1 in centralMirror

[ca-stefan-cordes]

Workaround is to add

	<build>
		<pluginManagement>
			<plugins>
				<plugin>
					<groupId>org.apache.maven.plugins</groupId>
					<artifactId>maven-site-plugin</artifactId>
					<version>3.8.2</version>
				</plugin>
			</plugins>
		</pluginManagement>

to the pom.xml

Probably some other versions in MuleLifecycleMapping needs to be re-checked.

Best would be to not specify versions in the java sources.

[julianpascualMuleSoft]

Pull request #337 merged, thanks Stefan!