Remove unnecessary EventArgs allocation in HighResTimer

[axtox]

Description

There's a minor optimization in HighResTimer where we can avoid allocating a new EventArgs object every time the timer elapses. Instead, we can use EventArgs.Empty to reduce memory usage and improve performance, which is especially important in resource-constrained environments.

Motivation and Context

• There is related Discord thread on the HighResTimer issue that is crashing due to out of memory exception and one of the causes is unnecessary memory allocation during the event firing.

How Has This Been Tested?

• Only successfully rebuild the solution without flashing to the ESP32

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• I have added new tests to cover my changes.

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⛔ Files ignored due to path filters (1)

• nanoFramework.Hardware.Esp32/HighResTimer.cs is excluded by none and included by none

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[CLAassistant]

All committers have signed the CLA.

[axtox]

@dotnet-policy-service agree

[josesimoes]

\azp run

[josesimoes]

LGTM! Thank you for the improvement.