Bump pytest-notebook from 0.8.0 to 0.8.1 in /extra_requirements (#69)

Bumps [pytest-notebook](https://github.com/chrisjsewell/pytest-notebook) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/chrisjsewell/pytest-notebook/releases)
- [Commits](chrisjsewell/pytest-notebook@V0.8.0...v0.8.1)

---
updated-dependencies:
- dependency-name: pytest-notebook
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

extra_requirements/requirements-tests.txt

@@ -18,7 +18,7 @@ pytest-cov==4.0.0
 pytest-forked==1.4.0
 pytest-runner==6.0.0
 pytest-xdist==3.0.2
-pytest_notebook==0.8.0
+pytest_notebook==0.8.1
 wimprates==0.4.1
 scipy==1.6.0; python_version<='3.7'
 scipy==1.9.3; python_version>'3.7'