Bump matplotlib from 3.10.1 to 3.10.3 in the python-updates group

Bumps the python-updates group with 1 update: [matplotlib](https://github.com/matplotlib/matplotlib).


Updates `matplotlib` from 3.10.1 to 3.10.3
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.10.1...v3.10.3)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-version: 3.10.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: python-updates
...

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

Author: dependabot[bot]

install/testing_requirements.txt

@@ -6,6 +6,6 @@ pytest-timeout==2.4.0
 mock==5.2.0
 python-dateutil==2.9.0.post0
 anyio==4.9.0
-matplotlib==3.10.1
+matplotlib==3.10.3
 mpmath==1.3.0
 rich==14.0.0