remove deprecated code for backwards weak ext support

Author: anthony

Project.toml

@@ -26,7 +26,6 @@ RecipesBase = "3cdcf5f2-1ef4-517c-9805-6587b60abb01"
 Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 ScientificTypes = "321657f4-b219-11e9-178b-2701a2544e81"
 Serialization = "9e88b42a-f829-5b0c-bbe9-9e923198166b"
-StatisticalMeasures = "a19d573c-0a75-4610-95b3-7071388c7541"
 StatisticalMeasuresBase = "c062fc1d-0d66-479b-b6ac-8b44719de4cc"
 StatisticalTraits = "64bff920-2084-43da-a3e6-9bb72801c0c9"
 Statistics = "10745b16-79ce-11e8-11f9-7d13ad32a3b2"

src/MLJBase.jl

@@ -310,10 +310,4 @@ export default_measure
 export pdf, sampler, mode, median, mean, shuffle!, categorical, shuffle,
    levels, levels!, std, Not, support, logpdf, LittleDict
 
-# for julia < 1.9
-if !isdefined(Base, :get_extension)
-    include(joinpath("..","ext", "DefaultMeasuresExt.jl"))
-    @reexport using .DefaultMeasuresExt.StatisticalMeasures
-end
-
 end # module