build(deps): bump third-party/doxyconfig from 89c8ec9 to ff572e5

Bumps [third-party/doxyconfig](https://github.com/LizardByte/doxyconfig) from `89c8ec9` to `ff572e5`.
- [Commits](LizardByte/doxyconfig@89c8ec9...ff572e5)

---
updated-dependencies:
- dependency-name: third-party/doxyconfig
  dependency-version: ff572e53b688fc152cd3b1b8cadee5e6f6fdd078
  dependency-type: direct:production
...

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Author: dependabot[bot]