Dockerfile: update to xx 1.4.0

[crazy-max]

related to #4933 (comment)

- What I did

update xx to 1.4.0

- How I did it

- How to verify it

- Description for the changelog

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.43%. Comparing base (d06f137) to head (adb0180).
Report is 921 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4937      +/-   ##
==========================================
- Coverage   61.47%   61.43%   -0.04%     
==========================================
  Files         289      289              
  Lines       20226    20237      +11     
==========================================
  Hits        12433    12433              
- Misses       6892     6903      +11     
  Partials      901      901              

[thaJeztah]

Hm... looks like this one is definitely flaky;

--- FAIL: TestPromptForConfirmation (0.60s)
    --- FAIL: TestPromptForConfirmation/case=reader_closed (0.38s)
        utils_test.go:222: PromptForConfirmation did not return after promptReader was closed
FAIL
panic: send on closed channel

goroutine 127 [running]:
github.com/docker/cli/cli/command_test.TestPromptForConfirmation.func8.2()
	/Users/runner/work/cli/cli/src/github.com/docker/cli/cli/command/utils_test.go:209 +0x6d
created by github.com/docker/cli/cli/command_test.TestPromptForConfirmation.func8 in goroutine 126
	/Users/runner/work/cli/cli/src/github.com/docker/cli/cli/command/utils_test.go:207 +0x3aa
FAIL	github.com/docker/cli/cli/command	0.691s

[thaJeztah]

oh! thought I LGTM'd, but I probably forgot because I had to kick CI