Promote agnhost to 2.57

Author: drjackild

registry.k8s.io/images/k8s-staging-e2e-test-images/images.yaml

@@ -33,6 +33,7 @@
     "sha256:e729df863cf62ba0363b611302784bc4b2fa79effcd057e7342bd22658ccb71d": ["2.54"]
     "sha256:541cafada1867e8684b25d24f0cb1132e76aff093401b5987490b654fbd79c0a": ["2.55"]
     "sha256:352a050380078cb2a1c246357a0dfa2fcf243ee416b92ff28b44a01d1b4b0294": ["2.56"]
+    "sha256:80658cfc42bff7977efaa188e661631202fdbe810c4e17b2fcc84e2a3ac79298": ["2.57"]
 - name: apparmor-loader
   dmap:
     "sha256:60629fe42de6260c9b930b48a2923b69168dc1c71fa5f762f70036477ffd74b6": ["1.2"]