Bump default Agent version to 7.55.2

[sblumenthal]

What does this PR do?

A brief description of the change being made with this pull request.

Motivation

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Additional Notes

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Minimum Agent Versions

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

• Agent: v7.55.2
• Cluster Agent: v7.55.2

Describe your test plan

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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 47.51%. Comparing base (6263597) to head (8457c07).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1332   +/-   ##
=======================================
  Coverage   47.51%   47.51%           
=======================================
  Files         230      230           
  Lines       22040    22040           
=======================================
  Hits        10472    10472           
  Misses      10976    10976           
  Partials      592      592           

Flag	Coverage Δ
unittests	47.51% <ø> (ø)

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

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[sblumenthal]

/merge

[dd-devflow]

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[sblumenthal]

/remove

[dd-devflow]

🚂 Devflow: /remove

[dd-devflow]

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