greta.dynamics 0.2.3

This release restores greta.dynamics to CRAN. It was archived in September
2025 as a consequence of its dependency, greta, being archived. greta 0.6.0
returned to CRAN in July 2026, which unblocks this resubmission.

Documentation fixes

• The @return documentation for iterate_matrix(), iterate_dynamic_matrix()
  and iterate_dynamic_function() named a list element stable_state, which
  none of these functions actually return. The documentation now uses the real
  names: stable_distribution for iterate_matrix(), and stable_population
  for iterate_dynamic_matrix() and iterate_dynamic_function().
• Added worked examples to iterate_dynamic_matrix() and
  iterate_dynamic_function(), which previously had none.

Internal changes

• Now requires greta >= 0.6.0.
• Removed LazyData from DESCRIPTION, as the package ships no data.