Update MarginalModel for changes in SymbolicRandomVariable#323

ricardoV94 wants to merge 1 commit intopymc-devs:mainpymc-devs/pymc-extras:mainfrom

ricardoV94:fix_marginal_model_failure_jaxricardoV94/pymc-extras:fix_marginal_model_failure_jaxCopy head branch name to clipboard