Fix imports

Author: penelopeysm

src/mcmc/gibbs.jl

@@ -660,7 +660,7 @@ function gibbs_step_recursive(
 
     # Construct the conditional model and the varinfo that this sampler should use.
     conditioned_model, context = make_conditional(model, varnames, global_vi)
-    vi = subset(global_vi, varnames)
+    vi = DynamicPPL.subset(global_vi, varnames)
     vi = match_linking!!(vi, state, model)
 
     # TODO(mhauru) The below may be overkill. If the varnames for this sampler are not