reticulate 1.46.0

• Internal updates to avoid R_NamespaceRegistry and R_UnboundValue in
  compiled code on R-devel (4.6) (#1894).

• Internal updates to remove Rf_findVar* calls in compiled code on R-devel (4.6)
  (#1892).

• Internal updates for Rcpp compatibility around Rf_error handling (#1887).

• Fixed py_list_packages() for uv-managed environments. (#1890, #1891)