build(deps): bump matplotlib from 3.4.2 to 3.4.3 (#226)

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.4.2 to 3.4.3.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](https://github.com/matplotlib/matplotlib/compare/v3.4.2...v3.4.3)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

scripts/KlipperScreen-requirements.txt

@@ -1,6 +1,6 @@
 humanize==3.9.0
 jinja2==3.0.1
-matplotlib==3.4.2
+matplotlib==3.4.3
 netifaces==0.11.0
 requests==2.25.1
 vext==0.7.6