tweak dash_renderer artifact specs & logic

as the recent versions of dash (> 1.21.0) have
the `dash_renderer` merged within the dash repo.

Namely, we need
- grab the `dash_renderer` module from the main `dash` module
- to override the `namespace` value
  with `"dash_renderer" to fetch from the
  correct URL, we do something similar for the renderer deps
  just above.

Author: etpinard

gen_resources/Sources.toml

@@ -4,7 +4,7 @@
     url = "https://github.com/plotly/dash.git"
     tag = "v2.0.0"
 [dash_renderer]
-    module = "dash_renderer"
+    module = "dash._dash_renderer"
     resources_path = "."
 [components]
     [components.dash_html_components]

src/init/resources.jl

@@ -45,11 +45,12 @@ function setup_renderer_resources()
         )
     )
 
-    DashBase.main_registry().dash_renderer = dash_module_resource_pkg(
-            renderer_meta["deps"][1],
-            resource_path = renderer_resource_path,
-            version = renderer_meta["version"]
-            )
+    renderer_renderer_meta = renderer_meta["deps"][1]
+    DashBase.main_registry().dash_renderer = ResourcePkg(
+        "dash_renderer",
+        renderer_resource_path, version = renderer_meta["version"],
+        dash_module_resource.(renderer_renderer_meta["resources"])
+    )
 end
 
 function load_all_metadata()