python3Packages.jaxlib{-bin}: no longer need to pin the cudaPackages version

pkgs/top-level/python-packages.nix

···
 
   jaxlib-bin = callPackage ../development/python-modules/jaxlib/bin.nix {
     cudaSupport = pkgs.config.cudaSupport or false;
-    # At the time of writing (2022-04-18), `cudaPackages.nccl` is broken, so we
-    # pin to `cudaPackages_11_6` instead.
-    cudaPackages = pkgs.cudaPackages_11_6;
   };
 
   jaxlib-build = callPackage ../development/python-modules/jaxlib rec {
···
     };
     # Some platforms don't have `cudaSupport` defined, hence the need for 'or false'.
     cudaSupport = pkgs.config.cudaSupport or false;
-    # At the time of writing (2022-04-18), `cudaPackages.nccl` is broken, so we
-    # pin to `cudaPackages_11_6` instead.
-    cudaPackages = pkgs.cudaPackages_11_6;
     IOKit = pkgs.darwin.apple_sdk_11_0.IOKit;
     protobuf = pkgs.protobuf3_20; # jaxlib-build 0.3.15 won't build with protobuf 3.21
   };