Update use of packages to the latest

Signed-off-by: Rolf Neugebauer <rn@rneugeba.io>

examples/hostmount-writeable-overlay.yml

@@ -2,15 +2,15 @@ kernel:
   image: linuxkit/kernel:5.4.30
   cmdline: "console=tty0 console=ttyS0 console=ttyAMA0 console=ttysclp0"
 init:
-  - linuxkit/init:a0246dd478a24abbee0a4cede99662ffc4931691
-  - linuxkit/runc:69b4a35eaa22eba4990ee52cccc8f48f6c08ed03
-  - linuxkit/containerd:09553963ed9da626c25cf8acdf6d62ec37645412
-  - linuxkit/ca-certificates:v0.7
+  - linuxkit/init:f670045ecb6ec31ea37dd10114366e9a1e915013
+  - linuxkit/runc:1eef77f5963e44e491abfe392206769037d47ae2
+  - linuxkit/containerd:8ee7a0d636fff9df7e13076f5492d06274e5f644
+  - linuxkit/ca-certificates:abfc6701b9ca17e34ac9439ce5946a247e720ff5
 onboot:
   - name: sysctl
-    image: linuxkit/sysctl:v0.7
+    image: linuxkit/sysctl:541f60fe3676611328e89e8bac251fc636b1a6aa
   - name: dhcpcd
-    image: linuxkit/dhcpcd:v0.7
+    image: linuxkit/dhcpcd:2f8a9b670aa6e96a09db56ec45c9f07ef2a811ee
     command: ["/sbin/dhcpcd", "--nobackground", "-f", "/dhcpcd.conf", "-1"]
 onshutdown:
   - name: shutdown
@@ -18,7 +18,7 @@ onshutdown:
     command: ["/bin/echo", "so long and thanks for all the fish"]
 services:
   - name: getty
-    image: linuxkit/getty:v0.7
+    image: linuxkit/getty:48f66df198981e692084bf70ab72b9fe2be0f880
     env:
      - INSECURE=true
     runtime:
@@ -30,7 +30,7 @@ services:
           destination: writeable-host-etc
           options: ["rw", "lowerdir=/etc", "upperdir=/run/hostetc/upper", "workdir=/run/hostetc/work"]
   - name: rngd
-    image: linuxkit/rngd:02c555b50cd1887aa628836662d2eec54c0d7e81
+    image: linuxkit/rngd:7fab61cca793113280397dcee8159f35dc37adcb
   - name: nginx
     image: nginx:1.13.8-alpine
     capabilities: