remove Forwards compat test

test/packages/Basic.jl

@@ -429,12 +429,10 @@ import Malt
         @test index_order == [3, 2, 1]
     end
 
-    pre_pkg_notebook = read(joinpath(@__DIR__, "old_import.jl"), String)
-    local post_pkg_notebook = nothing
-
     @testset "File format -- Backwards compat" begin
         🍭 = ServerSession()
-
+
+        pre_pkg_notebook = read(joinpath(@__DIR__, "old_import.jl"), String)
         dir = mktempdir()
         path = joinpath(dir, "hello.jl")
         write(path, pre_pkg_notebook)
@@ -460,57 +458,6 @@ import Malt
         cleanup(🍭, notebook)
     end
 
-    @static if VERSION < v"1.10.0-0" # see https://github.com/fonsp/Pluto.jl/pull/2626#issuecomment-1671244510
-        @testset "File format -- Forwards compat" begin
-            # Using Distributed, we will create a new Julia process in which we install Pluto 0.14.7 (before PlutoPkg). We run the new notebook file on the old Pluto.
-            test_worker = Malt.Worker()
-
-            @test post_pkg_notebook isa String
-
-            Malt.remote_eval_wait(Main, test_worker, quote
-                path = tempname()
-                write(path, $(post_pkg_notebook))
-                import Pkg
-                # optimization:
-                if isdefined(Pkg, :UPDATED_REGISTRY_THIS_SESSION)
-                    Pkg.UPDATED_REGISTRY_THIS_SESSION[] = true
-                end
-
-                Pkg.activate(;temp=true)
-                Pkg.add(Pkg.PackageSpec(;name="Pluto",version=v"0.14.7"))
-                # Distributed is required for old Pluto to work!
-                Pkg.add("Distributed") 
-
-                import Pluto
-                @info Pluto.PLUTO_VERSION
-                @assert Pluto.PLUTO_VERSION == v"0.14.7"
-            end)
-
-            @test Malt.remote_eval_fetch(Main, test_worker, quote
-                s = Pluto.ServerSession()
-                nb = Pluto.SessionActions.open(s, path; run_async=false)
-                nb.cells[2].errored == false
-            end)
-
-            # Cells that use Example will error because the package is not installed.
-
-            # @test Malt.remote_eval_fetch(Main, test_worker, quote
-            #     nb.cells[1].errored == false
-            # end)
-            @test Malt.remote_eval_fetch(Main, test_worker, quote
-                nb.cells[2].errored == false
-            end)
-            # @test Malt.remote_eval_fetch(Main, test_worker, quote
-            #     nb.cells[3].errored == false
-            # end)
-            # @test Malt.remote_eval_fetch(Main, test_worker, quote
-            #     nb.cells[3].output.body == "25"
-            # end)
-
-            Malt.stop(test_worker)
-        end
-    end
-
     @testset "PkgUtils -- reset" begin
         dir = mktempdir()
         f = joinpath(dir, "hello.jl")