generate release notes (#8476)

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Author: github-actions[bot]

documentation/releaseNotes/releaseNotes.v8.1.2.md

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+Today we are releasing the 8.1.2 build of the `dotnet monitor` tool. This release includes:
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+- Updated dependencies
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+If you would like to provide additional feedback to the team [please fill out this survey](https://aka.ms/dotnet-monitor-survey?src=rn).