Merge pull request #1805 from rabbitmq/dependabot/maven/5.x.x-stable/org.apache.maven.plugins-maven-source-plugin-3.4.0

Bump org.apache.maven.plugins:maven-source-plugin from 3.3.1 to 3.4.0

Author: michaelklishin

pom.xml

@@ -76,7 +76,7 @@
     <maven.release.plugin.version>3.2.0</maven.release.plugin.version>
     <versions.maven.plugin.version>2.20.1</versions.maven.plugin.version>
     <maven.resources.plugin.version>3.4.0</maven.resources.plugin.version>
-    <maven.source.plugin.version>3.3.1</maven.source.plugin.version>
+    <maven.source.plugin.version>3.4.0</maven.source.plugin.version>
     <groovy.maven.plugin.version>2.1.1</groovy.maven.plugin.version>
     <groovy.all.version>2.4.21</groovy.all.version>
     <build.helper.maven-plugin.version>3.6.1</build.helper.maven-plugin.version>