fix: remove invalid --depth 0 from git clone command

- Git CLI doesn't accept --depth 0
- Remove --depth flag to perform full clone (needed for workflow git operations)

.gitea/workflows/nix-update.yml

@@ -22,7 +22,7 @@ jobs:
     steps:
       - name: Checkout repository
         run: |
-          git clone --depth 0 ${{ secrets.NIX_UPDATE_TOKEN }}@${{ github.server_url }}/${{ github.repository }}.git .
+          git clone ${{ secrets.NIX_UPDATE_TOKEN }}@${{ github.server_url }}/${{ github.repository }}.git .
 
       - name: Check for available packages to update
         id: check-packages