Fix wrong logging for wrong fleet api version response

[pchila]

What does this PR do?

Fix a log message when fleet returns an error due to a wrong api version

Why is it important?

This avoids a noisy formatting error in logs

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added an entry in ./changelog/fragments using the changelog tool
• [ ] I have added an integration test or an E2E test

Author's Checklist

• [ ]

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Pinging @elastic/elastic-agent-control-plane (Team:Elastic-Agent-Control-Plane)

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• Start Time: 2023-11-03T13:58:30.228+0000

• Duration: 19 min 12 sec

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[pchila]

buildkite test this

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