Upgrade actions

Author: Emin017

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     name: Zig ${{ matrix.zig }} on ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: cachix/install-nix-action@v19
         with:
           install_url: https://releases.nixos.org/nix/nix-2.13.3/install