Upgrade to docker/login-action@v2

Author: krivard

.github/workflows/ci.yaml

@@ -13,7 +13,7 @@ jobs:
           fetch-depth: 1
 
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v2
         with:
           registry: ghcr.io
           username: cmu-delphi-deploy-machine