ruby treewide: don't merge source into top-level

Keep the `source` attrset distinct to prevent its entries from merging
with the top level attrs.
Since each type of source has a different set of entries for `source`,
this is the easiest way to keep them together.
This will pave the way for a new `url` type of source.

This is a mass-rebuild of many ruby packages,
notably those using `git` type sources.

pkgs/development/ruby-modules/bundled-common/functions.nix

@@ -67,8 +67,10 @@ rec {
         };
     in res;
 
-  composeGemAttrs = ruby: gems: name: attrs: ((removeAttrs attrs ["source" "platforms"]) // attrs.source // {
+  composeGemAttrs = ruby: gems: name: attrs: ((removeAttrs attrs ["platforms"]) // {
     inherit ruby;
+    inherit (attrs.source) type;
+    source = removeAttrs attrs.source ["type"];
     gemName = name;
     gemPath = map (gemName: gems."${gemName}") (attrs.dependencies or []);
   });