Bump python/pybind11 from 19a6b9f to a406a62 (#110)

Bumps [python/pybind11](https://github.com/pybind/pybind11) from `19a6b9f` to `a406a62`.
- [Release notes](https://github.com/pybind/pybind11/releases)
- [Commits](pybind/pybind11@19a6b9f...a406a62)

---
updated-dependencies:
- dependency-name: python/pybind11
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>