New version: TransferMatrix v3.0.1

[JuliaRegistrator]

• Registering package: TransferMatrix
• Repository: https://github.com/garrekstemo/TransferMatrix.jl
• Created by: @garrekstemo
• Version: v3.0.1
• Commit: 9ffd94e4e9b415d6777509dfd0160f56ff037b29
• Reviewed by: @garrekstemo
• Reference: garrekstemo/TransferMatrix.jl@9ffd94e#commitcomment-180288564
• Description: A general 4x4 transfer matrix for optical waves in layered media for Julia
• Release notes:

## v3.0.1

### Bug fix
  - Fix data race in sweep_thickness — a single mutable layer vector was shared across threads, causing scrambled
  output when multithreading was enabled. Each thread now operates on its own copy.

### Examples
  - Update dbr_cavity, fabry-perot, and quarter_wave examples for v3 TransferResult return type

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