Bump python_orocos_kdl/pybind11 from 0dcf6f2 to 8b03ffa (#444)

Bumps [python_orocos_kdl/pybind11](https://github.com/pybind/pybind11) from `0dcf6f2` to `8b03ffa`.
- [Release notes](https://github.com/pybind/pybind11/releases)
- [Commits](pybind/pybind11@0dcf6f2...8b03ffa)

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

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