ruby: Drop cargo, it's not used by yjit

- https://github.com/ruby/ruby/blob/0b559eab0447905a784092824e5ea0999018cd01/yjit/yjit.mk#L22-L27

Only `$RUSTC`, which desugars to `rustc` by default, is used for yjit.
Note that the plumbing for cargo does exist, but is used for development
purposes only.

Signed-off-by: Samuel Dionne-Riel <samuel@dionne-riel.com>
(cherry picked from commit 90e5b96d7fc14cd8b4e290769f4d188e75329a32)

pkgs/development/interpreters/ruby/default.nix

@@ -20,7 +20,6 @@
   buildEnv,
   bundler,
   bundix,
-  cargo,
   rustPlatform,
   rustc,
   makeBinaryWrapper,
@@ -104,7 +103,6 @@ let
           # - In $out/lib/libruby.so and/or $out/lib/libruby.dylib
           removeReferencesTo,
           jitSupport ? yjitSupport,
-          cargo,
           rustPlatform,
           rustc,
           yjitSupport ? yjitSupported,
@@ -154,7 +152,6 @@ let
           ])
           ++ ops yjitSupport [
             rustPlatform.cargoSetupHook
-            cargo
             rustc
           ]
           ++ op useBaseRuby baseRuby;