Detected by
https://dev.azure.com/vcpkg/public/_build/results?buildId=104413&view=results
```
error: The following files are already installed in /mnt/vcpkg-ci/installed/x64-linux and are in conflict with pocketpy:x64-linux
Installed by pybind11:x64-linux
include/pybind11/embed.h
include/pybind11/functional.h
include/pybind11/operators.h
include/pybind11/pybind11.h
include/pybind11/stl.h
```
Broken by https://github.com/microsoft/vcpkg/pull/39510, in which
pybind11 support was added.
