update login action

Signed-off-by: souravbiswassanto <saurov@appscode.com>

Author: souravbiswassanto

.github/workflows/build-postgres.yml

@@ -78,7 +78,7 @@ jobs:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
     - name: Log in to the DHI registry
-      uses: docker/login-action@v2
+      uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4.1.0
       with:
         registry: dhi.io
         username: ${{ secrets.DOCKERHUB_USERNAME }}