Update broken url

Author: cake-duke

test/datasets.jl

@@ -13,7 +13,7 @@ ncar_hash = artifact_hash("ncar", artifact_toml)
 if ncar_hash === nothing || !artifact_exists(ncar_hash)
   oldhash = ncar_hash
   ncar_hash = create_artifact() do artifact_dir     
-    Downloads.download("https://www.unidata.ucar.edu/software/netcdf/examples/sresa1b_ncar_ccsm3-example.nc",joinpath(artifact_dir,"ncar.nc"))
+    Downloads.download("https://archive.unidata.ucar.edu/software/netcdf/examples/sresa1b_ncar_ccsm3-example.nc",joinpath(artifact_dir,"ncar.nc"))
   end
   if oldhash !== nothing
     unbind_artifact!(artifact_toml, "ncar")