Check MATLAB version ≥ R2024b before calling `refinepeaks` in `pulsedetection.m`

[dcajal]

The function refinepeaks is used in pulsedetection.m, but this function was only introduced in MATLAB R2024b.

Currently, if a user runs the code with an older MATLAB release, it will throw an error since refinepeaksis not available.

Proposed solution:

Add a version check before calling refinepeaks. If MATLAB is older than R2025a, either:

• Provide a fallback implementation
• Display a clear error message indicating the required MATLAB version.