[default/images] Bump default agent/cluster agent version to 7.56.0

[jennchenn]

What does this PR do?

Bump default agent/cluster agent version to 7.56.0

Motivation

7.56.0 was released.

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Write there any instructions and details you may have to test your PR.

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.18%. Comparing base (0df2c70) to head (9e58005).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1363   +/-   ##
=======================================
  Coverage   47.18%   47.18%           
=======================================
  Files         215      215           
  Lines       18702    18702           
=======================================
  Hits         8824     8824           
  Misses       9411     9411           
  Partials      467      467           

Flag	Coverage Δ
unittests	47.18% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
pkg/defaulting/images.go	100.00% <ø> (ø)

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0df2c70...9e58005. Read the comment docs.

[jennchenn]

/merge

[dd-devflow]

🚂 MergeQueue: waiting for PR to be ready

This merge request is not mergeable yet, because of pending checks/missing approvals. It will be added to the queue as soon as checks pass and/or get approvals.
Note: if you pushed new commits since the last approval, you may need additional approval.
You can remove it from the waiting list with /remove command.

Use /merge -c to cancel this operation!

[jennchenn]

/remove

[dd-devflow]

🚂 Devflow: /remove

[dd-devflow]

⚠️ MergeQueue: This merge request was unqueued

This merge request was unqueued

If you need support, contact us on Slack #devflow!