tholden/dynareOBC: DynareOBC v2.72.1618

This release fixes a bug preventing the use of cubature in models with only a single shock, as well as updating various dependencies. It also changes how impulse responses are calculated in the presence of correlated shocks. Rather than following Dynare and using the Cholesky decomposition, DynareOBC now takes the matrix square root. In most cases, this is far more sensible. For example, in a symmetric multi-country model, with correlated productivity shocks across countries, taking the matrix square root ensures that the impulse responses are identical in all countries, something that is not true under the Cholesky decomposition