Bump thirdparty/cppzmq from 160ac8e to 6164cf7 (#167)

Bumps [thirdparty/cppzmq](https://github.com/zeromq/cppzmq) from `160ac8e` to `6164cf7`.
- [Release notes](https://github.com/zeromq/cppzmq/releases)
- [Commits](zeromq/cppzmq@160ac8e...6164cf7)

---
updated-dependencies:
- dependency-name: thirdparty/cppzmq
  dependency-type: direct:production
...

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