Add `EnvironmentalConsiderations` to ML model

[Maximilian Combüchen]

This is to track the addition of new field $.components[].modelCard.considerations.environmentalConsiderations from spec version 1.6.

See:

• https://cyclonedx.org/docs/1.6/json/#components_items_modelCard_considerations_environmentalConsiderations
• CycloneDX/specification#395

[Niklas]

Implemented in #178