feat: update img binary to v0.5.6

[jackfrancis]

Reason for Change:

Use the latest published version of img for the binary we put on the node vms.

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[jackfrancis]

to @mboersma for updating acs-mirror binaries

Here's the canonical source:

https://github.com/genuinetools/img/releases/tag/v0.5.6

[mboersma]

/lgtm

[CecileRobertMichon]

we should run a non-docker container runtime cluster e2e test for this as it's the only path using img (non of our current e2e tests cover that I believe).

/hold

[CecileRobertMichon]

codecov will work after rebase

/label needs-rebase

[CecileRobertMichon]

test with containerd passed
/lgtm
/hold cancel

[codecov]

Codecov Report

Merging #259 into master will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #259      +/-   ##
==========================================
+ Coverage   53.21%   53.25%   +0.03%     
==========================================
  Files          95       95              
  Lines       14248    14246       -2     
==========================================
+ Hits         7582     7586       +4     
+ Misses       6001     5995       -6     
  Partials      665      665

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: CecileRobertMichon, jackfrancis, mboersma

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