Fix CI

Author: Sukant Hajra

Diff for: .github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
       with:
         name: shajra
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
-    - uses: DeterminateSystems/magic-nix-cache-action@main
+    - uses: DeterminateSystems/magic-nix-cache-action@v0.1.3
     - run: cat /etc/nix/nix.conf
     - run: cat ~/.config/nix/nix.conf
     - run: nix --print-build-logs build --print-out-paths .#ci