Update Appx manifest to newer version to fix unvirtualizedResources capability

[SteveL-MSFT]

PR Summary

Per Appx team, the request for unvirtualizedResources isn't being respected because the version of OS specified is too low. Based on their guidance, fix is to update the MaxTestedVersion to 10.0.18362.0 which should fix the problem where the registry is still being virtualized and thus not committing system level changes outside of the process.

PR Context

Fix #14957

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[ghost]

🎉v7.2.0-preview.6 has been released which incorporates this pull request.:tada:

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[jborean93]

@SteveL-MSFT is there a chance this could be backported for 7.1.x rather than waiting for 7.2 to come out?