Bump org.apache.maven.plugins:maven-source-plugin from 3.3.1 to 3.4.0 (openhab#5157)

Bumps [org.apache.maven.plugins:maven-source-plugin](https://github.com/apache/maven-source-plugin) from 3.3.1 to 3.4.0.
- [Release notes](https://github.com/apache/maven-source-plugin/releases)
- [Commits](apache/maven-source-plugin@maven-source-plugin-3.3.1...maven-source-plugin-3.4.0)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pom.xml

@@ -399,7 +399,7 @@ Import-Package: \\
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-source-plugin</artifactId>
-          <version>3.3.1</version>
+          <version>3.4.0</version>
         </plugin>
 
         <plugin>