Bump org.apache.maven.plugins:maven-source-plugin from 3.3.1 to 3.4.0 (#125)

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Author: dependabot[bot]

pom.xml

@@ -106,7 +106,7 @@
       <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>