Update matplotlib requirement in /scripts/local-requirements

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@v3.4.0...v3.5.1)

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

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

Author: dependabot[bot]

scripts/local-requirements/requirements.txt

@@ -1,4 +1,4 @@
 PyYAML~=6.0
 mbed-tools~=7.50.0
 cantools~=37.0
-matplotlib~=3.4
+matplotlib~=3.5