Bump pybind11 from 2.9.2 to 2.11.1 (#368)

Bumps [pybind11](https://github.com/pybind/pybind11) from 2.9.2 to 2.11.1.
- [Release notes](https://github.com/pybind/pybind11/releases)
- [Changelog](https://github.com/pybind/pybind11/blob/master/docs/changelog.rst)
- [Commits](pybind/pybind11@v2.9.2...v2.11.1)

---
updated-dependencies:
- dependency-name: pybind11
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

doc/requirements.txt

@@ -4,7 +4,7 @@ ipykernel==6.22.0
 jinja2==3.0.3
 nbsphinx==0.9.3
 pennylane==0.30.0
-pybind11==2.9.2
+pybind11==2.11.1
 pygments==2.17.2
 pygments-github-lexers==0.0.5
 qiskit==0.44.1