Bump ansys-sphinx-theme from 0.9.8 to 0.9.9 (#308)

Bumps [ansys-sphinx-theme](https://github.com/ansys/ansys-sphinx-theme) from 0.9.8 to 0.9.9.
- [Release notes](https://github.com/ansys/ansys-sphinx-theme/releases)
- [Commits](ansys/ansys-sphinx-theme@v0.9.8...v0.9.9)

---
updated-dependencies:
- dependency-name: ansys-sphinx-theme
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>