Update Mutex usage in .NET 9 when the "user-specific named mutex" feature is added

[daxian-dbw]

Prerequisites

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Description of the new feature/enhancement

When using Mutex in .NET Core, .NET creates a folder in the temp directory with world write access, which raises potential security concerns. .NET 9 will add a new feature to offer user-specific named mutex, and we will need to switch to that when it's available.

Proposed technical implementation details (optional)

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