promote pause image to 3.7

Signed-off-by: Paco Xu <paco.xu@daocloud.io>

docs/cri/config.md

@@ -137,7 +137,7 @@ version = 2
   selinux_category_range = 1024
 
   # sandbox_image is the image used by sandbox container.
-  sandbox_image = "k8s.gcr.io/pause:3.6"
+  sandbox_image = "k8s.gcr.io/pause:3.7"
 
   # stats_collect_period is the period (in seconds) of snapshots stats collection.
   stats_collect_period = 10

docs/cri/crictl.md

@@ -59,29 +59,29 @@ command. With the load command you inject a container image into the container
 runtime from a file. First you need to create a container image tarball. For
 example to create an image tarball for a pause container using Docker:
 ```console
-$ docker pull k8s.gcr.io/pause:3.6
-  3.6: Pulling from pause
-  fbe1a72f5dcd: Pull complete
-  Digest: sha256:3d380ca8864549e74af4b29c10f9cb0956236dfb01c40ca076fb6c37253234db
-  Status: Downloaded newer image for k8s.gcr.io/pause:3.6
-  k8s.gcr.io/pause:3.6
-$ docker save k8s.gcr.io/pause:3.6 -o pause.tar
+$ docker pull k8s.gcr.io/pause:3.7
+  3.7: Pulling from pause
+  7582c2cc65ef: Pull complete
+  Digest: sha256:bb6ed397957e9ca7c65ada0db5c5d1c707c9c8afc80a94acbe69f3ae76988f0c
+  Status: Downloaded newer image for k8s.gcr.io/pause:3.7
+  k8s.gcr.io/pause:3.7
+$ docker save k8s.gcr.io/pause:3.7 -o pause.tar
 ```
 Then use `ctr` to load the container image into the container runtime:
 ```console
 # The cri plugin uses the "k8s.io" containerd namespace.
 $ sudo ctr -n=k8s.io images import pause.tar
-  Loaded image: k8s.gcr.io/pause:3.6
+  Loaded image: k8s.gcr.io/pause:3.7
 ```
 List images and inspect the pause image:
 ```console
 $ sudo crictl images
 IMAGE                       TAG                 IMAGE ID            SIZE
 docker.io/library/busybox   latest              f6e427c148a76       728kB
-k8s.gcr.io/pause            3.6                 ed210e3e4a5ba       683kB
-$ sudo crictl inspecti ed210e3e4a5ba
+k8s.gcr.io/pause            3.7                 221177c6082a8       311kB
+$ sudo crictl inspecti 221177c6082a8
   ... displays information about the pause image.
-$ sudo crictl inspecti k8s.gcr.io/pause:3.6
+$ sudo crictl inspecti k8s.gcr.io/pause:3.7
   ... displays information about the pause image.
 ```
 
@@ -201,7 +201,7 @@ $ crictl info
       }
     },
     "streamServerPort": "10010",
-    "sandboxImage": "k8s.gcr.io/pause:3.6",
+    "sandboxImage": "k8s.gcr.io/pause:3.7",
     "statsCollectPeriod": 10,
     "containerdRootDir": "/var/lib/containerd",
     "containerdEndpoint": "unix:///run/containerd/containerd.sock",