Dependencies clean up

[bertfrees]

This PR is part of https://github.com/daisy/pipeline/pull/503.

Depends on:

• [x] https://github.com/daisy/pipeline-framework/pull/115
• [x] https://github.com/daisy/xproc-maven-plugin/pull/20
• [x] https://github.com/daisy/xspec-maven-plugin/pull/15
• [x] https://github.com/daisy/pipeline-build-utils/pull/32
• [ ] https://github.com/daisy/pipeline-scripts-utils/pull/83

[bertfrees]

Merged in 49d2503809a5a16a5383b4c13cde208b8e39f694