Bump lib/CPP_PTB from ed00ab9 to b5dcdff (#71)

Bumps [lib/CPP_PTB](https://github.com/cpp-lln-lab/CPP_PTB) from `ed00ab9` to `b5dcdff`.
- [Release notes](https://github.com/cpp-lln-lab/CPP_PTB/releases)
- [Commits](cpp-lln-lab/CPP_PTB@ed00ab9...b5dcdff)

---
updated-dependencies:
- dependency-name: lib/CPP_PTB
  dependency-type: direct:production
...

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