Update matplotlib requirement from ~=3.5 to ~=3.9 in /package (#1987)

Updates the requirements on [matplotlib](https://github.com/matplotlib/matplotlib) to permit the latest version.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.5.0...v3.9.1)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-type: direct:production
...

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

package/test_requirements.txt

@@ -9,7 +9,7 @@ black~=23.3
 boto3~=1.34
 flake8~=7.1
 isort~=5.11
-matplotlib~=3.5
+matplotlib~=3.9
 mypy~=1.10
 moto~=5.0.9
 psutil==5.9.6  # same as Kedro for now