docs-deps(deps): bump matplotlib from 3.10.6 to 3.10.8 in /docs

Bumps [matplotlib](https://github.com/matplotlib/matplotlib) from 3.10.6 to 3.10.8.
- [Release notes](https://github.com/matplotlib/matplotlib/releases)
- [Commits](matplotlib/matplotlib@v3.10.6...v3.10.8)

---
updated-dependencies:
- dependency-name: matplotlib
  dependency-version: 3.10.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]