skipper-internal: Update to version v0.21.257-1079

Update container-registry.zalando.net/teapot/skipper-internal to version v0.21.257-1079

Author: k8s-on-aws-manager-app[bot]

cluster/manifests/skipper/deployment.yaml

@@ -1,7 +1,7 @@
 {{/* image-updater-bot detects *image variables so use print to disable it for main image */}}
 
 {{ $main_image := print "container-registry.zalando.net/teapot/skipper-internal:" "v0.21.247-1070" }}
-{{ $canary_image := "container-registry.zalando.net/teapot/skipper-internal:v0.21.256-1078" }}
+{{ $canary_image := "container-registry.zalando.net/teapot/skipper-internal:v0.21.257-1079" }}
 
 
 {{/* Optional canary arguments separated by "[cf724afc]" to allow whitespaces, e.g. "-foo=has a whitespace[cf724afc]-baz=qux" */}}