Bump matplotlib from 3.9.1 to 3.9.2

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.9.1 to 3.9.2.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.9.1...v3.9.2)

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

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

Author: dependabot[bot]

install/testing_requirements.txt

@@ -6,4 +6,4 @@ pytest-timeout==2.3.1
 mock==5.1.0
 python-dateutil==2.9.0.post0
 anyio==4.4.0
-matplotlib==3.9.1
+matplotlib==3.9.2