Updating reusable workflow references (#32)

Author: kron-spar

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Log in to package registry
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ghcr.io
           username: ${{ github.actor }}