Bump matplotlib from 3.7.0 to 3.7.1 (pyvista#4091)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.7.0 to 3.7.1.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.7.0...v3.7.1)

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

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

requirements_docs.txt

@@ -8,7 +8,7 @@ ipyvtklink==0.2.3
 jupyter_sphinx==0.4.0
 jupyterlab==3.6.1
 lxml==4.9.2
-matplotlib==3.7.0
+matplotlib==3.7.1
 meshio==5.3.4
 mypy==1.0.1
 mypy-extensions==1.0.0