fix: change require BpmnMoodle

[gabrieldesar]

Which issue does this PR address?

Closes #18

Acceptance Criteria

• Corresponds to the concept
• Corresponds to the design

Definition of Done

• corresponds to the design principles
• corresponds to the code standards
• passes Continuous Integration checks
• available as feature branch on GitHub
  • contains the cleaned up commit history
  • commit messages satisfy our commit message guidelines
  • a single commit closes the issue via Closes #issuenr

[CLAassistant]

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[gabrieldesar]

using @pinussilvestrus solution

[nikku]

Happy to merge this if you bump bpmn-js and bpmn-moddle dependencies to @latest, too (and the CI is green).