Bump matplotlib from 3.8.1 to 3.8.2 in /.github/dependabot

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.8.1 to 3.8.2.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.8.1...v3.8.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/dependabot/constraints.txt

@@ -7,7 +7,7 @@ fonttools==4.44.3
 h5py==3.10.0
 karabo-bridge==0.7.0
 kiwisolver==1.4.5
-matplotlib==3.8.1
+matplotlib==3.8.2
 msgpack==1.0.7
 msgpack-numpy==0.4.8
 mypy-extensions==1.0.0