Update node shell to use Alpine 3.13 (#2792)

Signed-off-by: Lauri Nevala <lauri.nevala@gmail.com>

src/main/shell-session/node-shell-session.ts

@@ -77,7 +77,7 @@ export class NodeShellSession extends ShellSession {
           }],
           containers: [{
             name: "shell",
-            image: "docker.io/alpine:3.12",
+            image: "docker.io/alpine:3.13",
             securityContext: {
               privileged: true,
             },