You could try this way (include instead of exclude)
<configuration>
<!-- switch on dependency-driven aggregation -->
<includeDependencySources>true</includeDependencySources>
<dependencySourceIncludes>
<!-- include ONLY dependencies I control -->
<dependencySourceInclude>org.test.dep:*</dependencySourceInclude>
</dependencySourceIncludes>
</configuration>
Other way is to use artifact id (rather than package name)
<configuration>
<!-- switch on dependency-driven aggregation -->
<includeDependencySources>true</includeDependencySources>
<dependencySourceExcludes>
<!-- exclude ONLY commons-cli artifacts -->
<dependencySourceExclude>commons-cli:*</dependencySourceExclude>
</dependencySourceExcludes>
</configuration>