Bump Microsoft.Build.Utilities.Core from 16.8.0 to 16.9.0 in /PxCoco
Bumps [Microsoft.Build.Utilities.Core](https://github.com/microsoft/msbuild) from 16.8.0 to 16.9.0.
- [Release notes](https://github.com/microsoft/msbuild/releases)
- [Commits](https://github.com/microsoft/msbuild/commits/v16.9.0)
Signed-off-by: dependabot[bot] <support@github.com>
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