Remove 23.05 channel & add 24.05 (#22)

Keeping the 23.11 channel around since it shows as
deprecated on https://search.nixos.org/packages

Signed-off-by: Gerhard Lazu <gerhard@dagger.io>

.github/workflows/build.yml

@@ -36,8 +36,8 @@ jobs:
         nixPath:
           - nixpkgs=channel:nixos-unstable
           - nixpkgs=channel:nixpkgs-unstable
-          - nixpkgs=channel:nixos-23.05
           - nixpkgs=channel:nixos-23.11
+          - nixpkgs=channel:nixos-24.05
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository