build(deps): bump doxygen-awesome-css from 4593c19 to 568f56c

Bumps [doxygen-awesome-css](https://github.com/jothepro/doxygen-awesome-css) from `4593c19` to `568f56c`.
- [Release notes](https://github.com/jothepro/doxygen-awesome-css/releases)
- [Commits](jothepro/doxygen-awesome-css@4593c19...568f56c)

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

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