Bump docker/cli 19.03 with rollback_config interpolation fix

[silvin-lubecki]

- What I did
It bumps docker/cli with this fix: docker/cli#1973
Fix #559

- How to verify it
docker app rendering the following file does not fail:

$ cat test.dockerapp
# This section contains your application metadata.
# Version of the application
version: 0.1.0
# Name of the application
name: hello-world
# A short description of the application
description: "Hello, World!"
# List of application maintainers with name and email for each
maintainers:
  - name: user
    email: "user@email.com"
---
# This section contains the Compose file that describes your application services.
version: "3.7"
services:
  hello:
    image: hashicorp/http-echo
    command: ["-text", "${text}"]
    ports:
      - ${port}:5678
    deploy:
      rollback_config:
        parallelism: "${deploy.rollback-config.parallelism}"
        max_failure_ratio: "${deploy.rollback-config.max_failure_ratio}"
---
# This section contains the default values for your application parameters.
port: 8080
text: Hello, World!
deploy:
  rollback-config:
    parallelism: 3
    max_failure_ratio: 0.9

$ docker app render test.dockerapp
...

- Description for the changelog

• Bump docker/cli 19.03 with rollback_config interpolation fix

- A picture of a cute animal (not mandatory but encouraged)

[codecov]

Codecov Report

Merging #572 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #572   +/-   ##
=======================================
  Coverage   70.67%   70.67%           
=======================================
  Files          55       55           
  Lines        3223     3223           
=======================================
  Hits         2278     2278           
  Misses        646      646           
  Partials      299      299

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[ulyssessouza]

LGTM