Add prefect-kubernetes 0.7.2 release notes

[devin-ai-integration]

Adds release notes for prefect-kubernetes version 0.7.2, documenting the feature added in #19957 (semaphore to limit concurrent API calls during Kubernetes observer startup).

This PR was generated using just prepare-integration-release prefect-kubernetes. Once merged, the prefect-kubernetes-0.7.2 tag will be created to trigger the release.

Checklist

• This pull request references any related issue by including "closes <link to issue>"
  • N/A - release notes PR
• If this pull request adds new functionality, it includes unit tests that cover the changes
  • N/A - documentation only
• If this pull request removes docs files, it includes redirect settings in mint.json.
  • N/A - no docs removed
• If this pull request adds functions or classes, it includes helpful docstrings.
  • N/A - documentation only

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Link to Devin run: https://app.devin.ai/sessions/a35b24f550544b098e450e9b77f83f03
Requested by: [email protected] (@desertaxle)

[devin-ai-integration]

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