Update docker/build-push-action digest to 84ad562

Author: renovate[bot]

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
           images: mountainash/openssh-client
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4
+        uses: docker/build-push-action@84ad562665bb303b549fec655d1b64f9945f3f91
         with:
           context: .
           push: true