workflows: update cargo dependencies correctly (#37)

.github/workflows/build_nix.yml

@@ -3,21 +3,15 @@ on:
   pull_request:
   push:
 jobs:
-  checkout:
-    runs-on: self-hosted
-    steps:
-    - uses: actions/checkout@v4
   check_flurry_package:
     runs-on: self-hosted
     steps:
       - run: nix flake check -L --all-systems
   build_flurry_package:
     runs-on: self-hosted
-    needs: checkout
     steps:
       - run: nix build -L
   build_flurry_shell:
     runs-on: self-hosted
-    needs: checkout
     steps:
       - run: nix shell -L --command echo 'it works'

.github/workflows/update.yml

@@ -13,8 +13,6 @@ jobs:
         uses: actions/checkout@v4
       - run: nix shell nixpkgs#cargo --command cargo update
       - run: nix shell nixpkgs#git --command git add Cargo.lock
-      - run: "nix shell nixpkgs#git --command git commit -m 'cargo: update Cargo.lock'"
-      - run: nix flake update
       - name: Check flake
         uses: DeterminateSystems/flake-checker-action@main
       - run: nix build