Bump matplotlib from 3.6.0 to 3.7.2

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.6.0 to 3.7.2.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.6.0...v3.7.2)

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

Signed-off-by: dependabot[bot] <support@github.com>

docs/requirements_docs.txt

@@ -38,7 +38,7 @@ littleutils==0.2.2
 llvmlite==0.39.1 
 locket==1.0.0 
 markdown-it-py==2.1.0 
-matplotlib==3.6.0 
+matplotlib==3.7.2 
 mdit-py-plugins==0.3.1 
 mdurl==0.1.2 
 mistune==2.0.4