Update dependency org.apache.maven.plugins:maven-source-plugin to v3.4.0

Author: renovate[bot]

pom.xml

@@ -134,7 +134,7 @@
  <plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-source-plugin</artifactId>
- <version>3.3.1</version>
+ <version>3.4.0</version>
  <executions>
  <execution>
  <id>attach-sources</id>