Update main.yml

Author: Sly-Harvey

.github/workflows/main.yml

@@ -44,7 +44,7 @@ jobs:
           remove-codeql: "true"
           remove-docker-images: "true"
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: "Install Nix ❄️"
         uses: cachix/install-nix-action@v26