chore(deps): bump doxygen/doxygen-awesome-css (#312)

Bumps [doxygen/doxygen-awesome-css](https://github.com/jothepro/doxygen-awesome-css) from `df88fe4` to `998eaf3`.
- [Release notes](https://github.com/jothepro/doxygen-awesome-css/releases)
- [Commits](jothepro/doxygen-awesome-css@df88fe4...998eaf3)

---
updated-dependencies:
- dependency-name: doxygen/doxygen-awesome-css
  dependency-type: direct:production
...

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