package/containerd: security bump to version 1.5.7

Fixes the following security issues:

- CVE-2021-41103: Insufficiently restricted permissions on plugin
  directories
  https://github.com/advisories/GHSA-c2h3-6mxw-7mvq

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/containerd/containerd.hash

@@ -1,3 +1,3 @@
 # Computed locally
-sha256  3a580cd5f125fd473c10a1ea38178b0f662777144a8cc83d97dba2d2350f2b17  containerd-1.5.5.tar.gz
+sha256  09be0cedea77568029aa0c7be9a323b89fa6886b402b5d223780a05b8c7cd45a  containerd-1.5.7.tar.gz
 sha256  4bbe3b885e8cd1907ab4cf9a41e862e74e24b5422297a4f2fe524e6a30ada2b4  LICENSE

package/containerd/containerd.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-CONTAINERD_VERSION = 1.5.5
+CONTAINERD_VERSION = 1.5.7
 CONTAINERD_SITE = $(call github,containerd,containerd,v$(CONTAINERD_VERSION))
 CONTAINERD_LICENSE = Apache-2.0
 CONTAINERD_LICENSE_FILES = LICENSE